I was thinking about going full out mining and start earning at least as much as I earn now (about €1900 after taxes) and quit my job and instead travel the world.

I currenltly have 13x1060 and 1x1080Ti which net me between $700-$1000/month (after electricity and it depends a lot on crypto price). I also have almost 6000 COSS tokens and if the exchange picks up and goes to Binance-volume in few years then I will probably not have to work for as long as they operate.
I was thinking about selling my car and getting twice as much hashpower and then just enjoy life in different parts of the world.

I believe mining is here to stay for as long as crypto will exist, which is forever.