For my money, there's hardly a better value in HiFi than the Bluesound Node2.
Expect to spend at least 5x-10x more for an equivalent feature set with better SQ.
Sure, the new Lumin P1 looks wonderful. At ~$10K, it ought to. Although it doesn't even use the top of the line ESS DAC chip (two ES9028PRO instead of one or two ES9038PRO chips).
If you're convinced you'll hear a significant difference with a separate, dedicated DAC (compared to the one built into the Node), then there may be no need for a new streamer. Just pipe the Node 2 into the DAC.
Another option would be a new integrated streamer/DAC/pre-amp to replace the Node entirely. Possibilities:
Bryston BDA 3.14, Matrix Element X, Exasound S88 (or the new S82 when it's out), Cambridge Edge NQ. These all have different strengths/weaknesses relative to each other. I have the Element X, which is the least expensive of these options at ~$3400. The Edge NQ seems to offer the best feature set and usability. Bryston has the longest warranty. Stereophile gives the S88 an A+ rating; I've never heard it, but suspect it would be the best of the bunch for sound quality (or if you ever want to venture into multichannel sound). For whatever it's worth, the Element X and the Exasound S88 both use the ES9038PRO DAC chip.
If you do want a separate, dedicated streamer then I'd agree the Sonore products (ultraRendu etc.) are worth a look. They are Roon-ready and also can function as HQ Player network audio adaptors.