The choice of monetization methods depends on the type of your application, the target audience, location, and other factors. For example:
The freemium model may be the top choice for a wellness, fitness, nutrition, photo-editing, or educational app.
Subscriptions can be a significant source of revenue for a mobile version of a video/audio streaming, dating, doctor appointment, or online media platform.
Games, messengers, and dating apps can generate revenue through in-app purchases.
In-app advertising seems like a universal revenue stream for any category except utility apps, e.g., a banking, construction, or hotel property management app.