Set your budget before any spin decides
Decide your session budget before the first spin, because nobody can predict when the bonus round lands. Its frequency is not known in advance, and the result of one session is random whatever the RTP. A high RTP describes the long run across many players, not the next hour at your screen. Only bet the amount you can afford to lose.
Read the game rules before you bet, because only they state which RTP version Winspirit runs. The two versions differ by a small margin, so the rules that apply to the version in use matter more than the name. Treat the rules as the final word on the version in play.
Treat the maximum win as a ceiling, not a target, because x50,000 of the bet is reached very rarely. No one can say in advance whether a session comes near it. Size your bet so that a long run of ordinary results still fits your budget.