Hi Roggae, glad to see you posting! And congratulations on your turntable and phono stage. I would encourage first to focus on getting the most out of your current system that you can before thinking about the next upgrade. Until you do so, you won't have a solid point of reference for comparison. Make sure your turntable, arm and cartridge are set up and fine tuned as well as they can be. Think about the rigidity and level of the surface on which your table sits. The foundation under your table can make a big difference in your results. Look at all of the cables in your system to ensure they are optimally dressed and separated from each other. Check and clean all of your contacts, particularly important from cartridge through phono stage due to the very low level signals here. If you don't currently have a dedicated AC line feeding power to your system, and if you can accomplish this, do it.
Once you have things in what you believe are good alignment, read and follow Lloyd Walker's recommendations for
fine tuning your turntable to get that next bit of improvement. His process for iteratively setting VTA and VTF to optimize the sound is the best fine tuning guide I know of.
When you've done these things, some further steps can include changing the brand of tubes in the Bellari, but don't go crazy here. Check the archives here to see if others have some suggestions for a brand of tube that might improve on the stock tube (but stay with the same type of tube), as well as any other specific Bellari tweaks that might improve on this good basic phono stage.
Good luck,