I am not going to follow along with what others are doing here. To start with, ask yourself if normal things bring you pleasure. Let me give you an example, a neurotypical person would most likely be getting satisfaction out of things such as 'cleaning' or 'meditation' like some of the previous comments have mentioned. When you actually complete an activity, and you do it well, do you feel gratification? If so, yes, those 'normie' activities might work.

If the answer is no, I would start looking beyond that if I was you, specifically your mental health. Pinpoint your shortcomings and rationalise them, for example by writing them down on a piece of paper. Now, I know I said mental health, but you can't have a level head without a good base, right? You're probably expecting me to say diet and exercise, and that would partially be true. But rather than giving you this ambiguous piece of advice, I would first break down your CURRENT diet. This will allow you to pinpoint what may be missing.

Now, to add to that, another thing you could do are, for example, DNA tests to rule any potential bottlenecks beyond your control. This could mean mutations to the MTHFR gene expression, improper thyroid regulation gene expression (hypo/hyper, tyrosine hydroxylase activity in the adrenal gland, by the way very key to producing enough dopamine and consecutively norepinephrine for our body to utilise, and guess what, those are key to motivation and alertness.). Take into account things such as methylation, cholination, any potential vitamin deficiencies (especially the B cat.). What I am trying to say is you want to rule out as many potential factors as you can, to ensure what you aren't overlooking any important cause for any symptoms.

THEN that's when exercise gets good, when you actually feel motivated to do it. Now, I'd at least start by building a small habit (1-2x week). It might not sound like much, but as you get physically healthier and your mental state clearer, there won't be anything stopping you from increasing the frequency. Do you see where I am going with this? If you learn that exercise can feel good, you'll want to do it more often from your own initiative because you'll simply find it engaging.