Sorry about your dad, Seth. Glad to see you back on the horse.
I have high and low points in my motivation too, this last year has been tough for a lot of reasons. Working on mopeds always makes me feel better, having little deadlines and small goals to achieve that I can control helps me handle the stress of stuff in my life I can't control. When mopeds just aren't happening in my life I try not to feel guilty, I've gotten good over the years at just letting all my moped projects chill and not stressing about that.
One thing I've found that really helps is to get a dumb stock bike running and tuned up. I usually have at least 2 or 3 waiting in the wings that just need a carb clean, tires, brakes, cables. I figured out years ago that if I push all my other projects aside and just fix up a dumb stock bike, my motivation comes back and I feel so good about myself, then I just keep that rolling and try to push forward on some of the more complex and challenging projects.
I also love dumping a cheap stocker back 'into the wild' since I know someone can hop on and start riding it from day one, but will quickly ease their way into fixing it as basic stuff breaks. I usually like to buy bikes for under 200 and get them running, riding, and fix any issues, and send them out for 300-600$ it pretty much just pays for parts but it's way cheaper than a psychiatrist.