Gaming is rather a way to reduce HP. The principle of a game is to make money - for the game designer! Only a minority of players can earn more than they invest.
One real way to increase HP instead is to run a witness node and get ranked to app. less than 80.
I have thought about running a witness node for awhile.
At some point I imagine I will dig in and do just that.
It is not that complicated, I created a step-by-step tutorial:
https://peakd.com/hive-121566/@stayoutoftherz/wie-man-einen-hive-witness-node-aufsetzt-ein-tutorial-fur-computerlaien