When I first started learning to improvise, an older kid in the neighbourhood showed me the A Minor Pentatonic Scale Box Shape 1 and assured me that would be all I need to play the blues!
As a 12-year-old, that sounded pretty good to me.
The reality, as I found out not long after, was not correct! Over a Blues in A, try using all these pentatonic scales over the progression – A minor, B minor, E minor, and F# minor scales. Use your ears and decide what you like. There might be some new sounds that you love, and also some new sounds you think are “wrong”. See how you can move from one scale to the next with your ideas. For example, over an A7 in an A blues, I might between the A minor, E minor, and F# minor scales. The B minor can be used, but it isn’t a sound I generally like.
But it might work for you!