Are you on medication, if your life circumstances have changed you might need to adjust the dose so it might be worth speaking to the doctor.
And if not, but you have access to it then it would be something to try.
In terms of what's actually helped me the most important thing is the concept that I can't fix everything at once, but an awareness that all the different issues caused by poor executive functioning (disorganised/messy house, poor sleep, poor diet, mood dysregulation, too much screen time (me and/or kids!), time blindness etc etc) sort of "rest on" each other and make all the other things more difficult because of their knock on effects.
What I used to do was feel vaguely panicked about everything being so crap all at once and out of control, and be overwhelmed and vaguely try to address issues at random, the fixes would either not work or they wouldn't stick or they would be buried in the fact everything else was not working either so nothing would ever actually change.
Picking 1-2 issues at a time to be a major focus and temporarily parking ALL guilt about the others, giving myself permission to do the bare minimum has helped with this. It means that for anything I work on, because I stick with it longer, it has the chance to actually sustain a longer term change. For example, I did all our finances and figured out a plan to clear our debts and not get more debt, which has reduced stress and once the debts were all paid off it reduced our outgoings significantly. Another area I focused on at some point was language because I live outside the UK, I can now speak it fluently enough to get through things like school meetings and doctors' appointments and make friends, which makes life easier and less stressful. Another area I focused on was sorting the house, which needs focus on it again - but that helped hugely because I actually got to the point of doing major decluttering and designating systems for things so, while "nutrition" is still parked in the "bare minimum" corner, so we eat a lot of pesto pasta and frozen pizza - it means when I do have to or want to use the kitchen to prepare something more interesting, I just have space to do it - I don't first have to work through 2 weeks' worth of backlogged washing up (which always left me exhausted and too drained to cook) AND I can invite people in without panic, which never would have worked before. While our house is not a showhome, it is now functional and we don't have to constantly shift clutter out of the way in order to perform basic tasks.