Have a reasonable window of focus:

    [done chunk][done chunk]...[itemized list of expanded chunk]...[todo chunk]...
                                ^ now

Me too, but I think that it an important realization to internalize. My list would take many lifetimes to complete. This is an important part of being a self-aware person or some people call it "adulting". For me at least, it is easy to get scared and run away from it. The more productive solution is to:

Realize these are things that you get to try, not have to do

Prioritize a few items, ideally some short term and some long term.

Set aside the master list and work on your immediate tasks until they are complete you realize you dont want to complete them.

occasionally revisit the master list and update it.

It can indeed be dauting. I think once I had the list I tried to make a plan that allowed me to hit multiple goals in the long term. For example building my website in high detail was so that I could learn enough to get a Big Tech type of job. Traveling around the world at least partly was to find a wife and start a family. For me, I took all the items on my list and tried to turn that into a direction. I also prune/add to the list when I am feeling down and trying to think of what to look forward to.