Limits of any single session
Decide before the first spin that the bonus round is a surprise, not a plan. How often it comes is not known in advance. No one can predict the next bonus round from earlier spins. The result of one session is random whatever the RTP is, and two sessions with the same bet can end in very different places.
Check which RTP version is running before you choose a title in the lobby. The game rules are the only place that shows it, and the Great Rhino series has three versions with different figures. Read the rules of the exact title you open, not the name on the tile.
Treat the top prize as a ceiling, not a goal. It is reached very rarely, and no spin brings it closer than any other. Its size only tells you the most one bet can return, not when that happens. Set your bet and your budget before the first spin, and stop when you reach the limit you set.