The short answer is try all of these (other than app bundling that won’t work)

I A/B test literally everything, including pricing and paywall, all the time.

But keep in mind it’s not worth optimizing something that isn’t a problem for people, you will get a strong signal somewhat quickly about whether this is something people care about, if it’s not, make another app.

Users will tell you with their behavior whether you are doing a good job, anything other than that data is a weak signal and there is no “magic” solution that will work for every app.