first, disconnect, clean contacts, reconnect your esisting system. many 'so much better' come from just this.
now listen well to your existing again.
think 'preferred', not 'better'.
when it comes to phono, eq, sut .... make sure you can return it if you don't prefer it to your exisiting.
I had an Audio Technica TT AT120. It had an optional dinky internal phono eq. most people would think it a joke. It sounded better than my McIntosh C28 SS Preamp's phono to me and mine.
Upstairs, I tried Cambridge DUO, ifi..., and found a $14. Pyle I preferred to both, sent the other's back.
Then I moved to Tube Phono stages, McIntosh mx110z downstairs, and Luxman tube in this office.
Think tube Preamp in your future.