As a reminder, when doing #ttrpg #worldbuilding , it's usually unnecessary to have human(oid) history go back "tens of thousands of years". If you need some justifications for old ruins and whatnot, it's easy to cram them into the last thousand years or less. Real world history is _full_ of interesting stuff happening in fairly short time periods, so it's not difficult to arrange the same for fictional worlds.

Besides, humans constantly come up with new ideas and new technology. If you _want_ human society in your fantasy world to have a typical late medieval/Renaissance-era tech level, then you will need to come up with some good reasons why they haven't developed further - and that gets trickier the longer the history of human civilization in your world is.

https://tvtropes.org/pmwiki/pmwiki.php/SciFiWritersHave/NoSenseOfTime