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However, it’s always based on your luck to get a positive outcome regardless of the method that use. This is the reason why casino usually choose slot games as only eligible games for bonuses wager.
Honestly, there’s no game or strategy that can guarantee safe and consistent wins, especially when it comes to games of luck. The game you mentioned, like any other with a house edge, is designed to favor the house over the long run. No matter what percentage advantage you aim for, the odds are still stacked against you.
Instead of overthinking or searching for a foolproof strategy, just play for the fun of it and hope for some luck. If you’re lucky, you’ll win and complete that wagering requirement, no special strategy can change that.
I agree with you two guys, instead of looking for strategies to fulfill the wagering requirements (and impact your bankroll if you aren't careful enough) why not simply enjoy one's session and if you end up being eligible that's all?
Not with slots, but I tried to maximize the probabilities of sorting this out playing dice with the max probability of winning, but, in the end, all is reduced to how lucky you are, IMO.