Before the spin, what stays unknown
Decide how much you will stake per spin, because nobody can tell in advance how often the bonus round comes in Sweet Bonanza. The result of one session is random, and that holds whatever the RTP version is. The RTP describes the return over a very large number of rounds, not a promise for your next ten spins.
Read the game rules first, because they alone show which RTP version Ubet Casino runs. Sweet Bonanza has two RTP versions with different returns. Once you know the version, compare its return in the table to the other one before you set a stake.
Set your expectations by the maximum win, which is 21,100 times the bet and a ceiling reached very rarely. A ceiling is not a target, so size each stake to what you can afford to lose. Treat the figure as the top of the scale, not the usual result.