In-App-Purchase or TapJoy .. or both?

I’d opt for both + app data monetization.

The safest mode here is indeed in-app purchases + user data monetization. If your app has 80 000+ DAU, it can help you earn money from every user who agreed to pass his non-personal info to your app. it requires from minimum to no efforts and allows you to monetize every app user, but the necessary requirement for data monetization is USER CONSENT. The app user must approve that he knows his non-personal data is being gathered.

i didn’t know that and was very fd up when GDPR came - needed to change the data monetization partner to more trusted one. now i work with Appgrow and very happy with my revenue

FYI I have a game app with geos USA LATAM, 5 000 640 installs and approx 800 000 DAU,so pm me if you have game-related questions