Welcome to Lemmy!
You might want to look into getting checked out for ADHD. Someone close to me was diagnosed as an adult a few years ago, and your behavior overlaps somewhat with their behavior. Many hours of making schedules and charting plans, but a strong mental block with putting plans into action to actually get things done. It’s more common than you’d think.
Thanks for your feedback, Kit. You may be glad to realize that I had already done exactly what you suggest I should have done, which is recommend that OP get checked out. Have a great night!