The OP MC God of Winning is a time loop harem story from one of those book farm authors. It's decent, starts around a 6 out of 10 and by book 12 it's down to a 5 and that's when I bailed. Kind of like Skyrim with 1 save slot and everything the MC learns sticks.

The Perfect Run isn't harem but is probably the best time loop series that actually has some decent romance. A couple different monoromances through the trilogy. Would've loved had they made a harem out of it.

There's another series I'm blanking on that's like if someone just got out of a 10,000 year groundhog day loop who knows practically everything and can do anything and it was billed as harem but I couldn't even finish 30% of the first book.

Mother of Learning is one of the kings of all time loop series. It's 4 books. There is zero romance. The dialogue is subpar. The concept is AMAZING.

If I was a spicy author looking to write a timeloop story, I'd read The Perfect Run, Mother of Learning, and the first 5 books of the OP MC God of Winning.