"Well, there's no strategy for winning from slots but like I said before ; when you hit big win just skip to other game etc and check the games with a high RTP (return to player) but most of all, follow your instinct! Expect to lose and when you win, you can enjoy your victory and maybe do a victory dance. ;)
I think somewhere in this forum there's a topic with favorite games and you can gain some info about them.
Personally I think Mythic Maiden, Magic Portals are the best games to wager the bonus.