op mc adventure novel
And I'm absolutely not up to date with the newest stories, so if you don't mind dropped ones (or ones with really long hiatuses), here are a few that fit what you're looking for (most of them are worth the read, even if they were dopped):
The Whisper of the Nightingale
I'm a Kitsune?
A Bored Immortal's Adventure with Reincarnation
Dragon Princess and Dragon Princess Reborn
The Beginning, The End and Everything in Between
And on NovelUpdates:
Demon Noble Girl
Um, sorry, I've been reincarnated
I Said Make my Abilities Average
Evil God Average
Do you any other preferences? Because "op mc adventure novel" is not very specific, almost half of Web novels/Light novels fall into that description.