If you don’t need volume control or MQA try a Topping E30. There are a lot of good DACs out there you don’t need to spend a fortune for great sound.
I added a Topping E30 to the digital output of my 20 year old Denon DCM-440. I wasn’t sure what to expect, but I definitely heard improvement...not huge improvement, but easily audible and easily worth the $130.