No upload but with VPN?

Our internet has had no idea since 1 1/2 blocked or simply broken uploads, so watch YouTube, watch Twitch, download things or everything else works, only log in to games or go online doesn't work, my parents didn't do anything on the Wi-Fi because who don't even know how Wi-Fi is written, because I recently installed and tested a VPN by chance, everything went suddenly, I could call people in Discord, log in, gamble, etc. Everything went wonderful, why is that only possible with VPN?

This is not due to the upload, but presumably. At any filter function or port lock that presumably Your router operates (alternatively your provider).

Which router, which provider and which specific problems do you have with the games?

You don't happen to be using a guest network on the router?

It's complicated haha, yes I use the guest access of my neighbors but about 1 year ago everything went perfectly and they themselves had problems with the internet and since then it has not worked anymore

This is probably due to the router firewall because every provider should have bought enough capacity on the IXs. Check the router dashboard to see if there are any filters.

A firmware update may have been made on the router (or, alternatively, the router was completely replaced), and the standard filter functions of the guest access were expanded through this firmware update.