Welcome Joe.
What is your price range? The WiiM products should give you a boost in sound quality over your current setup. Lots of detailed discussion over at the WiiM forum.
https://forum.wiimhome.com/I would look at the soon to be release WiiM Ultra which gives you a subwoofer output for short money over the WiiM Pro Plus. Pair it with your favorite power amp and you'll be rocking out. If you want a one box integrated streamer/power amp look at the WiiM amp, though I don't know if I will give you the b@lls you are looking for.
There are also Alexa controlled Amazon Music supported products from Bluesound, Denon, and Marantz.
The audio industry seemingly has limited interest in Alexa control of their devices. Most are using dedicated apps for control so if you are willing to forgo Alexa you'll have more choices.