Well for slots there is really not much strategy involved, for roulette or dice you can use a better strategy than another obviously no strategy will bring you 100% safe winnings but some are a little bit better than others
I know some people who dedicated their life in quest for finding 'better' or 'ultimate strategy' for gambling. If you are really good, you can be godlike with Poker or with Blackjack. But I never heard of any pro strategy they using while playing slots, so I assume there is no strategy at all.
Because there is not any strategy theres not much you can do besides just play. Of course with poker you can win if you are good, luck still plays a factor but yeah, poker, sport bets are the only gambling games that allow you to win if you have skill and a good strategy