Dang I'm liking the setup and the 3090s are crazy powerful and cost a mint! I believe they do 3x what my 1080 TI does so you're sitting good. Whatever you mine now you'll most likely be good to go for the long hold.

Also your right about ETH lol pretty sure they told us they would have a fix for fees etc back in 2017-2018 and it's now FINALLY somewhat being rolled out... I'm sure more delays are coming