Hi
I get that all the time. There are so many things I am interested in. What works for me is putting the other things on a list for later. I choose one thing that I want to concentrate on for a few weeks or however long the first
course takes. Then whenever an urge to get distracted by some other really great thing, I tell myself that I just need to postpone that for a little while and put it on a list of all the things I want to do.
After the course, maybe it’s not so important anymore. I also reward myself for finishing the course and doing each of the practicing. Like at the end of a guitar course, I would organize a “concert” with someone who understands me and appreciates my efforts (and will not criticize how I play).
If I keep my goals small, like just until the end of one course, it’s easier to fulfill and I don’t feel like I’m missing out on anything much.
This doesn’t mean that it will work for you. But I hope you can find something!