My experience with all in one wifi routers has been less than stellar and the wifi output inconsistent.
As with hifi audio, you get the best results with separates. Modem, wired router connected to a capable switch (I use Cisco 300 series), wireless access point(s) (I use Cisco again but there are cheaper options - like the every popular Ubiquiti).
An access point can be placed in the best spot in your house and you can fine tune the wireless signal - transmission power, channel, channel width as well as more esoteric settings - in a reliable way.
So my suggestion - instead of upgrading your router - is to disable the wifi and deploy an access point (or several) and fine tune the settings until you achieve the desired results.
A new router will offer no benefits in terms of wifi coverage or basic internet connectivity. The new wifi standards are not compatible with your Aries, Alexa is a gimmick and whatever extra processing power/extra memory would only be useful if you want to run plex on your router, UPnP, Open VPN etc.
I have to add, however, that since the generation 5 and newer 6 firmware, I have pretty much stopped using my Aries because it has become next to useless. As others report - it needs to be restarted on a regular basis (where before I would keep it on 24/7 and never had a glitch), playback stops in the middle of a track, it keeps disconnecting from Roon and mine is hardwired to my Cisco switch, as it has been from day one.
I personally suspect foul play to make you upgrade to one of the new (and ridiculously expensive) products. Or put it this way: a new firmware optimised for the latest generation. In my view it is clearly a case of a new firmware (and as per the company policy I am stuck with it) rendering my player obsolete. Which is why I am selling mine and looking for alternatives.