It looks like you're currently running the minidlna server (Music Server) on your AX68U and using the WiiM Home App (Controller) to browse your media and choose which speakers to play to (Renderers).
If all you need is the ability to browse your local media and play to UPnP or Chromecast devices then MinimServer (music server) and the BubbleUPnP app (controller) is the combination that offers the most flexible, functional and complete browsing experience, but both of these products cost money, so whether it's worth it really depends on how extensive your tags are as most servers only handle a common set of tags and don't allow for the configuration of browsing indexes e.g. Genre, Year, Date Added e.t.c.
Looking beyond local data you have all the online music services and that's typically where services like Roon, LMS, Jriver e.t.c. come in, they try and bring all your services under one umbrella, but that comes with a trade-off, and that's that they can't really compete with the best of breed offerings (the native apps). I have local music and Qobuz, and I prefer using the MinimServer/BubbleUPnP combination with the Qobuz app, but again it comes down to personal preference.
In addition to just bringing the music sources together they all offer extra functionality like metadata scraping (showing Artist/Album/Lyrics information), signal processing e.t.c. I don't know the solutions well enough to include everything they do so you'd need to look into that detail yourself.
In terms of setup most of the music servers (Roon and maybe JRiver being the exception) can all be installed on anything upwards of a raspberry pi, and they take care of all the heavy lifting (indexing, file serving, metadata scraping e.t.c) with your controller (WiiM Home App/BubbleUPnP/Browser) used just for browsing your sources and picking what speaker to play to. I don't have any experience of Roon or Jriver, but most of the servers can be configured over a web interface, so as long as you have a phone/tablet or PC that should be sufficient.
At this point it's probably down to you to investigate the various packages, how what they offer could benefit you, and whether it's worth the trade-off, be that UI, cost or complexity.
Hope that helps.
EDIT: One thing I did forget to mention is that some of these systems (Roon and LMS I think) can add compatibility to your existing speakers by translating protocols e.g. play Qobuz to your UPnP only speaker.