I made the following budget minded changes to the front end after initial setup. I have BS Node 2i and Topping D90 with AKM chip. Took some time research and learn. Discussions such as this are very helpful.
1. Better power cords for Node and D90. $200
2. Hardwired ethernet cable to streamer. $40
3. Dedicated power circuit for audio system. $500
4. Upgraded power supply to Node. $130
5. COAX from streamer to DAC. $40
6. DX Engineering EMI/RF filters on ethernet. $50
7. New cable modem router combination. It included a LPS and eliminated an older router and wall warts. FREE
8. Herbies firm fat dots. $80
Cumulatively, these changes made nice changes. Depth of soundstage, transients, sense of space, details revealed in bass, etc.
Then I added a Add-Powr Symphony IO. This improved the sound even more.
Sure, each step could have cost more and would probably improve the sound even more. If you upgrade the above steps, the cost goes from 100s to 1000s.