In 2012 John and peter planned to mine bitcoin but they let go because it wasn't profitable, if they managed to mine while it wasn't profitable imagine the gains today or even years later, what kind of miner are you? If you aren't preparing for the long term shot don't even bother
It depends on which coin is in question. It is difficult to know in advance. I used to have a lot of BTC and I bought a lot of other coins with them. I also mined many other coins. I kept them for years. After so many years I lost on almost all the coins. It's easy to talk now. It is not said in vain: "After the battle they are all generals."