Should I sell out all ETH? Or keep ETH on hand and keep mining patiently in order to come across next bull trend?
A miner will be a miner, unless if you leave and look for other opportunities.
If you are enjoying what you do(which is very important), you better have to stay in mining. Though it is possible that ETH will dump, it is still a profitable coin that we have. MIning ETH still good at all, it really has huge expenses but you can't hide that miners still making money from this.