I wrote a story called Saga of the Cosmic Heroes here and on RR. I dropped it because I was writing it in first person present tense from the perspective of a young military female officer, as well as a few other povs. My mental health deteriorated rapidly to the point where I just couldn't even think about the horrors of war from her pov, so I came clean and announced I was dropping it for those specific reasons.
It was 3 volumes long, just over 400k words, but I didn't get far into the 3rd volume. I kept dragging things out and adding a shit load of meanginless purple prose monologue before it finally dawned on me I couldn't depict first-hand warfare in 1st person present tense, not with my skills then, and I'm still not confident I could do it now, years later, after reading Frank Herbert's Dune and nearly finished with Iliad. I also did zero planning until it was way too late. There was no real ending to work towards until I came up with an exit strategy for the series(repurposed into Yellow Typhoon's, mainly).
Yellow Typhoon came to be a realized spiritual successor to Saga of the Cosmic Heroes. I've improved a lot with my mental health since by the time I penned it. I'm really happy I managed to tell the story I always wanted to tell. Unfortunately, it bombed harder than pearl harbor here and it only did somewhat barely better on RR. Interestingly, it got a little more views on Spacebattles (500). Currently I'm writing its own full-fledged novella/novel sequel and this time with a few ads (on RR at least) and I'll see how it goes. I'm better prepared now with all the awful experience I learned writing Cosmic Heroes. This time I spent months completing its outline from start to finish so even if it just straight up never gets seen by any eyes at least I'll be content I'm finally finishing a real full length story with a definite ending this time.