best slot game if you want to grind bonuses without massive swings.

Looking for recommendations on a slot that’s got enough bonus potential to keep things interesting but doesn’t blast your balance with wild up and down swings. I’m not chasing jackpots or huge hits - just want something where the bonus features show up often enough to keep the grind going and maybe chip away at wagering requirements.

I know volatility is the key, so I’m guessing some kind of low to medium variance game makes sense here. Tried a few older classics, but sometimes they’re so boring that I zone out before the bonuses even hit. Is there something out there right now with decent RTP, steady bonus frequency, and not so much dead spin action? Mostly doing this when watching live dealer or checking sports scores, so the aim is keeping things running and not getting frustrated with losing streaks.

Anyone got a favorite slot for bonus grinding without needing a pile of luck?