I think in this case another thread is even more appropriate: What is the Maximum Range I can Get?
A preamp you can often install closer to the antenna which can help.
Also the preamps generally used have very good filtering.
I favorite this one:
Useful items for purchase · wiedehopf/adsb-wiki Wiki · GitHub
But considering you already have good range, i doubt you’ll get too much improvement.
Then you can also get an Airspy Mini in addition to the preamp.
But that improvement is mostly message rate, not necessarily range.