The days of mining with your personal computers are over, unless you want your hardware to be toast for no reward.It is simply not worth the effort.Even many Graphic cards are obsolete.
this is sadly true ..
Another strategy is to mine some new coins whatever you think might be useful, before professional miners jumping into them. Maybe not be profitable at the beginning, but hold them until price goes up.!Speculative mining doesn't make sense as most likely you'll just be mining at a loss and waste electricity.
If mining is more expensive than just buying the coin, it makes more sense just buying the coin.
Currently it depends on your electricity-price if mining is profitable or not.
I have spent a lot of money building up a portfolio since mid 2018 till now. I'm currently running at losses. Mining might be the only way out right now. But I can't afford the complete setup. Is it possible to lease?