Try a bunch of different pellet weights/shapes/brands. They're like 22's, they all have a favorite
The upside is having a bunch of pellets to try if you get a new rifle. The downside is having a bunch of useless pellets if you don't... I've got about a dozen tins of stuff that never panned out for any rifle 😂
My Daisy 901 likes the Norma 8.2gr pointed or the Crosman 7.4gr pointed. The Hatsan Springer .22 and Beeman Chief .22 both like RWS Superdomes. The rest of the pellets just eat shelf space.
