It does not make any difference if the issue with your current streamer/DAC is the streamer or the DAC part of the device. If the device is faulty, then it needs to be replaced or repaired. If you really want to continue using your old device, you could try a different power supply.
Since 2016, streamers and streamer/DAC’s have improved a a lot. You can certainly get better sound quality if you get a separate streamer and DAC. It important to note that there are plenty of new streamer/DAC’s that will sound better than your 2016 streamer/DAC, whatever that is. There is nothing wrong with keeping things simple. Good luck finding your new streamer setup.