I dunno if you're still looking but I'll throw this out for anyone else that may need it too.

Alarms. Everywhere.

This may help this may not but I realized awhile ago that when trying to keep a schedule the idea of tracking the time and constantly looking at my phone and telling myself I only have 5 more minutes stressed me to the extreme. Something about feeling restricted by the number on a clock just gets to me. I started setting alarms. I set 2 depending on what the thing is. For example if I need to leave at a specific time to get to work on time I set alarm 1 twenty minutes before I need to leave the house and the second one right at the time that I need to leave. It created a low stress system in which I get a warning alarm saying its almost time to leave make sure I have everything and then a time to leave one. This system eliminated the stress of keeping track of time while also keeping me in check so I don't fall apart. I don't know how feasible this might be for work because depending on your job that may not even be allowed but it may be worth while to try and implement it in your home life especially if time is something you're stressing out about a lot! I've found this works well because it's not in your face, it's very in the background and it means you don't really have to think that you are doing it just be aware of it happening.

I like efficiency so I pair activities together a lot. Kill two birds with one stone and all that, for example if I'm making dinner and waiting for something to cook I'll do some of the dishes while I wait so I'm still nearby to check on the food but I'm actively getting another chore out of the way too. This also helps keep me "in the mode" so to speak, I've already prepped and started dinner so I'm already in a productive mental state, keep it going by doing other productive things.

I also try and do certain things as soon as I get home from work for the same reason. Need to clean the living room? It'll be tempting to just come home from work and sit down for a bit because you were at work all day- i don't. I immediately start doing whatever cleaning or chore needs to be done because my brain and body are already awake and ready to go and it helps to utilize that as much as you can- plus it means you're not sitting down just to get up and do more later.

I'm sure you've been told to try lists but even if lists don't work write stuff down. Always have a notebook and write down anything and everything that you might need for later or just want to make note of. It helps ingrain it into the brain and gives you reference for later. Even if you have to find 5 minutes looking for the right page the fact that you can hunt down a single page instead of skimming through a hundred emails can streamline important information in your life, not to mention the physical existence of things has a different bearing on the mind that words on a screen does.

Do a little each day. It's really easy to make yourself think it all needs to be done at once but it really doesn't. House a disaster after the holidays or visitors? Well you're only human and one human at that, do the dishes today and tidy up a living room table. Tomorrow you can take care of the counter tops and the kitchen floor and by the time the week is over you'll have cleaned up the house without stressing yourself out. This goes for other stuff too, it's easy to try and do too much which quickly becomes over bearing- break your activities and chores up where ever possible so you're draining yoursef.

ETA: Going to make a reminder about alarms here too, if you find it easier time yourself! Set an alarm for say, 20 minutes and do as much as you can in that 20 minutes. When the alarm goes off finish what you're doing and then drop it for the night. It may not seem like a lot but you'd be surprised how much you can get done in 20 minutes when you're not worrying about how much time you have left and just keep doing things.

We all have things like gaming and writing that we can use as a destressers but when you do an activity regularly as destressing as it can be it can also tend to become a little stressful (such as when you admin an rp site) find something else that also destresses you and make time for it. Even when you tell yourself you don't have the time train yourself to do it anyway. It won't happen over night. I'll use myself as an example: writing and gaming only go so far for me but a good bubble bath? oh that's heaven. And time consuming. So I've made myself do it once every couple of weeks just as am added nudge of relaxation. Once every couple of weeks doesn't feel like taking too much time out for it but it's enough to help. So if say you find watching movies super relaxing make a point to st down with some popcorn and watch one every couple of weeks! Or read for half an hour every few days, even if it's just a small chunk of time it still matter and it still helps.

and remember routines are hard to build and some people are just wired for it more than others (I've shown ocd tendencies since childhood and mental illnesses that find comfort in routines are fairly common on my father's side for example, so building routines was ingrained into me as a child) you're going to slip up those first few weeks and a lot of it is just finding what works for you and building on it. Take a moment here and there to look at what's happening when you're feeling stressed and try to determine why beyond just "i'm so busy" what specifically about the thing is making you stressed? The more you learn about what gets to you personally the more you can do to help keep yourself calm and make things easier on yourself! You don't need any super deep self reflection or anything but a little bit of tracking yourself and your own responses can go a long way to helping you figure out what works for you too.

Keep your chin up and remember what you've got in your life that makes you smile ovo when you're worried about how stressed you are take a moment to think about the good things, it's hard to do but even if you only do it for a moment you gotta make yourself smile here and there too!