^All good questions.
If you have insomnia and anxiety Adderall isn't the best drug. I would consider reducing the dose and taking it earlier in the day (or perhaps an IR version if you are taking the ER one, so that it doesn't last as long and keep you up). Honestly, staying at 1mg/day of clonazepam for 3 and 1/2 years is pretty good, I don't think a dose increase is that bad an idea given that you are on a very reasonable dose and have been for so long, many people want dose increases after like 1 week. Unless of course you are hoping to get off it? But I think the best idea is to try to reduce your insomnia and anxiety by other means, like changing your other meds, lifestyle changes, therapy, etc.
I dunno, I think a lot of people end up just not bothering to raise their dose anymore, even if it no longer does much other than relieve withdrawal symptoms. And then there are people, like someone I know, who have gotten to the point where they are taking like 20+mg per day (and I would have no idea he was on clonazepam at all if he didn't tell me, that quantity seems to do nothing for him now). Also, after being on it a while it can seem like it's still helping with anxiety because people get withdrawal symptoms and rebound anxiety when they don't take it, which it relieves.