Give yourself enough time (3 to 6 months or so) to figure this out and gradually change your behavior as you go.
The goal is for you to manage this more-or-less
automatically, and you can't expect to reach that quickly.
There's every chance you'll get some "quick wins" though - just getting rid of the biggest inappropriate commitments should free up quite a lot of your time.
Some things you can do early on:
*
Stop giving away your time
You've been playing poker with your hole cards face up. You need to stop giving away your time until you learn how to trade it.
Stop
offering to do things for other people
. Stop indicating you're
capable of doing freebies. Stop doing other people's
work for them just because you can. The NT world doesn't work that way. Humans aren't wired to do that without a negotiation.
Important: do this with no drama at all. Don't tell anyone,
especially family and colleagues. Never signal changes like this - it just turns your hole cards face up again.
*
Get good at refusals and at negotiating down an activity.
Be patient: this isn't something one can get right the first couple of times. Especially an Aspie. So at first, allow yourself to be a bit too generous in exchange for keeping the exchanges undramatic.
*
Set some personal objectives for things to do with the time that's released.
Something IRL, not online. And it has to be something solely for you. What you're looking for is essentially a displacement activity. So no volunteering
It doesn't have to be productive, useful, or have any direct effect on your personal development.
Don't just expand normal household activities. But new construction or a major garden project would be fine
Review it again as you get better at managing your time.
*
Work on learning how to recognize vampires.
Exchanging favors is a natural aspect of human group interaction. Participating this this kind of exchange with
real people is a good thing. Vampires just hijack the normal interactions. They can be handled if you identify them in time.
This isn't easy for an Aspie. Deficits in the core skills are literally part of the definition of ASD.
But you don't need the skills to
be a vampire - you just need to
see them, to identify real people who might pay you back, and to perform the basic negotiations