How high can one session climb?
Choosing a bet size sets what each spin costs, but it does not tell you when the free spins will come. How often the bonus round appears is not known in advance, and the result of one session is random whatever the RTP. Two players with the same bet can finish far apart.
Before you compare return figures, check which RTP version is running. That version is shown only in the game rules, so read them before you bet. A figure quoted elsewhere does not replace the rules. Read the rules once before your first spin.
Before you chase the top prize, know what the ceiling means. The maximum win of Gates of Olympus is x5,000 of the bet, a ceiling reached very rarely. Reaching it cannot be planned, so treat the number as a limit on the game, not a target for your session. Your bet size sets the money involved in each win.