Help me upgrade my beginner system!

So I’ve been an entry-level audiophile for a while - I’ve never spent a large amount of money to put together a truly impressive system. Currently, I have the following gear:

- Elac Discovery Music Server
- Technics SL-1700 Turntable w/Pickering XSV300 cartridge
- Peachtree Nova 300 Integrated Amp
- GoldenEar BRX Bookshelf speakers
- NHT SW2P Subwoofer (w/MA-1 amp)

I also have a bunch of gear I inherited from my brother (all from the 1990s) that I will be trading in to a local stereo shop. That’s where I need help. What should I add/replace to improve on my setup? I’m not sure what I’ll get for the traded-in gear, but I suspect I’ll be able to purchase around $2 - $2.5K in new gear.

I’m personally leaning towards a DAC to improve upon the one built into the Peachtree, and maybe a good power conditioner (although I’m currently using my brother’s old Tice Elite AC Conditioner). I’m very hesitant to replace the Elac Discovery because it comes with Roon and works with both Tidal and Qobuz. Anyway, would love to get your thoughts on this!