Should I sell my DAC

If you must have a new toy to play with sell the OPPO and buy a BlueNode 2i streamer. You apparently have abandoned the use and ownership of physical media! Read the editorial in the March Stereophile! 

Better to listen to potential units and compare, and only sell your OPPO after finding a better replacement. Versus selling the OPPO only to not find anything you like and regretting that you can't get the OPPO back.

To answer your original question, there are DACs in your budget that some would definitely consider a better choice than the OPPO, but there are also people would would have the opposite opinion. Without knowing what you find lacking, I think any suggestions could accidentally send you down the wrong path.

@ghulamr,If possible, retain the OPPO and use it as a transport. It is a great player for playing HDCDs. Get a separate DAC, if you can. Consider used DAC that were $2k, which you can get much cheaper now.

Can you stream Tidal MQA vis USB through the Oppo 105?

I have a Modwright Oppo 205 and you will have to pry it from my cold dead hands. But since I’m consolidating two listening rooms to one, so the wife can have the room, I will sell my Modwright Oppo Sonica DAC/streamer which sounds identical to the 205.