I already asked this in the webapp support chat but figured slack would be easier: Is it possible to create a metric that is only counted once if a user performed a specific event x times? If yes, how can I do that?

You can use a binomial metric: if a user triggers an event multiple times, binomial metric only counts once. Docs: https://docs.growthbook.io/app/metrics#conversion-types

What I want to do though is that it only triggers after the event has been triggered x (in my specific 4) times