I can't answer your question about YC, but you mentioned that you are looking for inspiration. For that, I recommend taking a look at Indie Hackers https://www.indiehackers.com/ and Failory https://www.failory.com/ - if you haven't already done so. Oh yeah and https://www.startupsfortherestofus.com/ - if you aren't looking to build a megabillion startup.