I'm especially looking for the self-insert type of stories where the MC takes advantage of his metaknowledge. It is really hard to find TOG fanfics, let alone TOG SI fanfics. Are there any in other languages like chinese or korean? I also couldn't find korean fanfic sites.
Not fanfic, but Webtoon with similar premise, guy climbs tower to become god, Called ranker who lives a second time, a webtoon, or the novel version called, Second Life Ranker. Though it has more RPG elements. https://tvtropes.org/pmwiki/pmwiki.php/FanficRecs/TowerOfGod, for a short list on Fanfic, not sure if there's any self insert types there. Did find this though, Pokemon X TOG, https://www.fanfiction.net/s/8775086/1/An-Irregular-Trainer this is self insert but pretty short, and seemingly dropped https://m.fanfiction.net/s/10409266/1/Phantom-s-Tower WebNovel.com, apparently has TOG fanfic, https://www.webnovel.com/book/12867990605732805/Tower-of-Dreams You could find more, if you google search or search on fanfic sites like wattpad, fanfiction.net, and archiveofourown.
Sadly TOG fanfics are rare and fanfics that I could tolerate are even rarer. (cant stand the mc) My favorites so far are: - https://www.fanfiction.net/s/9786024/1/Tower-of-Glorious-B-something - https://www.fanfiction.net/s/9967349/1/DisTowered - https://www.fanfiction.net/s/8775086/1/An-Irregular-Trainer