Here is the sentence:
Let the users spend more time playing this game and make the users come back often after their first-day of gameplay.
When I try to omit the "of" like this, the grammarly app tells me not to do so.
Let the users spend more time playing this game and make the users come back often after their first-day gameplay.
Well, when I read the sentence, I feel that omitting the "of" is all good. May I ask when two words need a preposition between them?