The "new" router is working. Invidious will be back in... RIGHT NOW.
(I'm supposed to have 700/700Mbps but I have ~500/500Mbps. Time to call my ISP again tomorrow lolol)
Because of DNS propagation, it can take some time to be available for everyone (and it could take more if you have some DNS caching server)
Oh, and if someone is wondering. The cost of the router was 17.50USD. I bought a more modern one for the solely purpose of handling the traffic that Invidious creates.
Feel free to donate if you value my work! https://nadeko.net/donate/