Sup.
Some of the comments here seem to be tracking a little heat for you
.
Your question is interesting. Usually the chaps who ask this question, are playing safe - building forts which find ways to dodge exposing themselves to chance.
As a result life becomes boring. It is kinda like life in that regard, if you don't get out, there are few !!fun!! Things or even just fun things that can happen.
You seem to not be in that category. As I said - usually the people asking this question are playing safe, you seem to be genuinely bored.
For one, take a break.
Try a Switch to adventure mode for a bit, explore one of your forts.
By your own description - mega projects are tedious. This should probably tell you a lot about your state of mind/expectations.
If all you are getting at the end of creating your vision is tedium, then either your vision is not invigorating, or the medium is too weak to contain it.
In essence you seem to have reached a mental point where you aren't finding fun in all the regular places. Based on your writing though, it seems more to do with what you want and expect than DF.
There is always a point where DF or any game feels pointless. You may have just reached it. Take a break, and just read stories about the game.
If you want I can chuck across an old save I was working on, making another morul. Got a few tedious skills out of the way, but a bunch more are left. Invasions off too.