Before the first bet, not after the bonus
Deciding whether to keep spinning for a bonus? Start from this: how often the bonus round comes is not known in advance. No one can predict it for your session. The result of one session is random, whatever the RTP says. RTP describes the average return over a very large number of rounds, so a short run can end far above or far below it.
Choosing between RTP versions? Read the game rules before you start. Which RTP version Spinup Casino runs for this game is shown only in those rules, so the rules are the place to check. A version with a different RTP pays differently over time, and the lobby title alone does not tell you which one is running.
Chasing the biggest prize? Treat the maximum win as a ceiling, not a target. Big Bass Bonanza caps a win at a multiple of the bet, and that ceiling is reached very rarely. Its value tells you the most a single bet can return, nothing about what your next spin will pay.