You could check sites like whattomine.com to check for the coin that is most profitable for your card.
Or you could look around like in telegram or maybe in the Altcoin Announcement section for new projects and then you can try to be one of the first miners.
But you always need to remember that probably 9 out of those 10 newly launched project will never make it to an exchange and your mined coins are worth 0 then.
Yes, i know but altcoin announcement is a jungle! I would like have a list with better coins to premine for not mining the 9 wrong