Maybe us the users could possibly organise this thing,maybe,just a thought?
That was my thoughts too, would still need official Aternos staff support to pull it off.
In the meantime it might be a good idea to try and convince mod/plugin owners to put them on curseforge (ect). Probably might want to also point out to mod owners (ect) the limitations of Aternos and how many people are missing out on their mods (ect) because of this, that will also help advertise Aternos and (as much as I hate ads) the more people watching their ads, the more money they have to spend on more datacentres.
Also maybe a simple web app that can perform all the duties of the website would be nice, everyone loves apps and they're easy to cram full of those delicious moneymaking ads.
The other reason to maybe have an app as well was purely for the ad money, my initial suggestion (I don't think they could use due to it being almost breaching and provider guidelines) would be to have a "donation" app that could be left open displaying ads to earn the user some kind of "Aternos points" that could be spent on que skips ect, however half of this idea could work too without any breaches of guidelines.
The hall of that idea that might work would be to have a functional web app like the first one I mentioned, with all the features of the website and customisable ads, a minimum level of ads (equivalent in earning potential to the website) that has no benefit besides the lovely service Aternos already provides, a middle level that has occasional full screen pop ups and a few benefits (maybe an occasional que skip) and a full donation mode that has a pop up video as after every action but maybe gives you a que skip every day
I found from messing around with aps that people actually appreciate customisation of the ads and there are a few who will even up the level of ads if the benefits are good enough, it's a very small percentage of users and my experience of making and publishing aps was just for fun but it's something to consider