Server Static IP not working

For a few months, whenever I've tried to connect to my server's Static IP, I am given a screen with the DynIP that also links to the /connect page that talks about the DynIP/DNS problems/etc. I have switched to Google's DNS server and I still get this message. This is particularly frustrating because I use Xaero's Mini & World Maps and all of the world map data is reset when I use the newest DynIP.

Please try to give me advice that isn't "try flushing your DNS cache", "use a different DNS server", "just use the DynIP, it's not that bad". It would also be really nice to have an actual dev on the thread.

Hope you're all staying healthy. Cheers!

Update: I've just tried to get onto my server after having to use the DynIP earlier today and it says "Can't connect to server" on my MC server list. Yes, it's online. Yes, other people are getting on. Yes, I've tried turning it off and then on again. I've also totally reinstalled my internet drivers. Going to the webpage and manually finding the DynIP worked, but it's still strange that MC wouldn't even recognize the server as open.

I'm not 100% sure what you meant by "where" I switched the server, but I followed this link's instructions exactly. It's the one offered by the Aternos /connect page. I used IPv6 and added both of the addresses that are offered for IPv6 (the first one in Preferred and the second in Alternate). The window pathway I took to get there was:

Control Panel > Network and Internet > Network Sharing Center > Change adapter settings > Wi-Fi > (right click) Properties > Networking > IPv6 > Properties > Advanced > DNS

which is the pathway that the page details.

Sorry if that's a lot of info to parse through or not what you were asking for.

Edit: Should probably mention now that I'm on Windows 10.