It seems that there is end of the year sale going on:

https://www.reddit.com/r/Fantasy/comments/zvmmxt/over_450_books_free_or_099_almost_175/

There is not much time left, but if somebody can point out some gems in the collection which would conform to this subreddit standard it would be great.

From my side I can add Mother Of Learning by nobody103
https://www.amazon.com/gp/product/B0BR2XVFT2
I have read online version of this masterpiece so I cannot weight on edits made into publication, but It is time-loop story done right. We have quite likable hero who grows in power and character while trying to solve mysteries connected to his unusual circumstances. It even somehow avoided the traps of making everything risk free or underpowered compared to MC since the world resets, cannot recommend more.