I don't really know the FOMO site you are referring to, but if you can still withdraw your assets there, you should withdraw now. to be honest I would rather hold ethereum than investing in something like that. as far as I know, you might be able to use the 4 eth you have to invest in other, more reliable places. there might be a way to get out of your situation, but it's quite difficult and risky.
He was FOMOing ESH when it reaches the peak price and it looks like he is a newcomer that didn't know about how the crypto pump and dump work. As far as I know, some people have been getting trapped by FOMO that already made by the whale. In the group, some people were complaining about they lose too.
It may a big risk to move into the another coin.