Went to depth 4k without prestiging. Was a little disappointed to see how many features were unexpectedly locked behind the amount of times you do it (or at least, the first one).
But alright, overall.
Thanks for playing that far! Good news: those unlocks aren't tied to how many times you prestige, they're tied to how deep your run was. If you prestige now after 4k, you get everything up to 4k in one go, the Forge included.
The game didn't make thaxt clear, so the next update shows exactly what your next prestige unlocks, based on how deep you've gone. Cheers