Pick an exchanges with reasonable proof of reserve, and to me there are only kraken and Binance. If you want to be extra safe, go peer to peer or use direct solution like Relai in Switzerland.
I would avoid coinbase and gemini, I don’t trust them for a few reasons, and the others like kucoin, crypto.com, etc. are just casinos like ftx. They are all likely to disappear when people realize how much of a scam Eth is.
As for Blockfi, sorry if you have funds there, you can consider them lost 