It’s a tough one mate, there’s no worse feeling than going hundreds of spins without a bonus, and then your next bonus is a garbage one; it happened to me with Napoleon the first (and, funnily enough, only) time I played it after seeing the potential.
I just try to offset that against the times that I’ve been mega lucky; for example, have you ever had a slot that’s bonused almost as soon as you’ve booted it up? Maybe even a run of bonuses across a few slots? Try not to let yourself get tilted, as that feeling of injustice will grow and grow.
Hopefully, by the time you’ve read this, you’ve had a halfway-decent bonus. Best of luck mate.