What strings are you using?
Many players use a different E string than the rest.
Don't be too quick to adjust the soundpost yourself, diy style. A top bass specialist/luthier has noted that the soundpost length, location, installation is one of the most difficult steps to get right in bass making.
A bass specialist can improve the sound with changes that do not occur to us.
They can set it up to your style of music and playing. During the early happy days of Covid I brought both my instruments separately in for spa treatment.
Sound improvements included new soundpost & location on the classical one, the jazz one a lighter tailpiece, tailpiece wire length & width at tailpiece nut, soundpost adjustment etc. He was even able to get a E string growl out of my little 3/4 bass, which it never had in my 46 years of ownership. Amazing, worth every penny spent on both basses and not expensive.