I've been testing Over Protocol for more then 7 month's and i got 75 OVER airdrop.... thry worth (15$)

But for VANA Testnet I've spent 1 day just for fun and i got 1.20 VANA. (32$)

Should i continue spending my time and focusing just on one protocol like i did with Over Protocol? F... Over Protocol 

It sounds like VANA Testnet is really paying off for you! Maybe it's worth exploring further and seeing where it takes you. Don't be afraid to switch your focus if it's proving to be more rewarding. Good luck with your crypto adventures!