I suggest you check the altcoin mining section from here https://bitcointalk.org/index.php?board=160.0

You can mostly see all GPU mining and they are only mining altcoin.

You can also check these tools which altcoin is profitable to mine with your GPU.

- http://whattomine.com/
- https://www.coincalculators.io/

But if you decided to make more profit check this link https://www.asicminervalue.com/