Can I already sell my SME? How and where?

Just link your wallet to tribaldex :)

I think no problem with the several DEXES (LeoDex, TribalDex, and others) we have on Hive. Your 115k liquid SME can be sold for 70 SWAP.HIVE. That's equivalent to 26.6 USD. And then from Hive, you can choose your preferred platform. Before I was using Binance. Now I am using MEXC.

However, if you want to sell your 20.7 M SME power, you have to un-stake it first. I am not sure how long will it take for your stakes to become liquid. Once they become liquid, you can follow the same process.