At this time, nothing. Henkaku was fixed with 3.61 and won't be ported there. No one (AFAIK) is working on getting an ePSP exploit going either to install on 3.61, so you're out of luck there. There's no way to downgrade, and there's not going to be a way to downgrade without having your own NAND backup of 3.60 or lower.
If you want native Vita homebrew you'll need a Vita with 3.60. You can try selling your Vita and getting either a brand new one (guaranteed to be on 3.5 or lower) or a used one guaranteed to be on 3.60 or lower. After that, read the stickies for information on Henkaku, which is the latest native hack.