I am not really, I felt there was issues with my build or class, so I made others, and this in turn has got my paragon up, at since 220-ish I pay it no mind atm, since I have all glyphs and legs I want, and feed the for every “X” surrounding glyph spots for now more ot less and i am not atm actively farming it. it’s more passive and i am ok with that tbh.
I tend to play with out a goal, and just decide based on what activity i am in the mood for, and sometimes farm some mats if i want to MW something.
That’s how i play tbh. and let things passively build and feed my eternal, meanwhile i enjoy the seasonal rewards on alts and playing other classes, and sometimes i will work on my main if i want to blast my highest Torment level for more mats etc
I don’t play in a meta mentality so, no racing to loop etc, so i don’t know how that feels apart from what i read here, about that, sucks if you cannot find fun in it. But arpgs have never really been forever games for me, so idk, it was more playthroughs, run throughs perhaps. MMo’s was my first real introduction to a second life game, and i have enjoyed them apart from the problems that you describe, so even super interesting loops at least for me have a limit before boredom, since it’s more or less endless.
Imo having fun and enjoying the game, is worth it more than if time spent no life-ing it is if that makes sense. Since at one point solo farming green drops in guild wars felt worth it, and I have since not loaded that game in years lol. 
Mostly though i find a build mechanics i like and have fun killing monsters with it and upgrading my loot, and perhaps i change and explore other unique’s or builds with a alt or if i have the gold i respec.In a sense this makes me slower to get through the content becasue i build based on what i want to do, what powers i want, and what rotation’s i think feel fun to play.
This stings sometimes when i hit a build celing or issue, before T4, allthough with the new Torments system its less of a issue since nothing i have built so far is stuck at T1 so T2-T3 are fine for me to explore endgame and i don’t really feel i am missing out,
So i prefer that over playing the meta and only playing with that goal in mind all the time
Hell Sometimes my head spins, since i too can feel “Bordem” but yet i once spent hours playing the tony hawk demo with my siblings, so sometimes i need to health check and remind myself, we can easily spoil ourselves and maybe get overly serious about gaming these days I get it though, i want to live in a game world most of the time, these days.