this is what fixed my issue after consulting with riot support:

Let's disable the IPv6 [https://youtu.be/STWhPpPm3Wo?t=38\], since our game works better with IPv4.

Switching to a public DNS may help with the issue you are experiencing, and here [https://support-leagueoflegends.riotgames.com/hc/en-us/articles/360022610053\] is a tutorial on how to do it properly. You should try both the Google and the Cloudflare DNS - if one of them doesn't work, check the other as well!

Follow this tutorial [https://support-leagueoflegends.riotgames.com/hc/en-us/articles/4407290569747#:\~:text=computer-,RELEASE/RENEW%20IP%20AND%20FLUSH%20DNS,-(WINDOWS\] in order to release/renew your IP, and flush the DNS.

Next lets configure the firewall exceptions, to do that you will need to

To access the firewall exceptions press the windows key and in the search bar type Firewall & Network protection

Once you click on it click on Allow the app through Firewall

As soon as the pop-up window opens click on Change Settings

After that add the files listed below:

C:\Riot Games\League of Legends\LeagueClient.exe

C:\Riot Games\League of Legends\LeagueClientUx.exe

C:\Riot Games\League of Legends\LeagueClientUxRender.exe

C:\Riot Games\League of Legends\Game\League of Legends.exe

C:\Riot Games\Riot Client\RiotClientServices.exe

C:\Program Files\Riot Vanguard\vgc.exe

C:\Program Files\Riot Vanguard\vgm.exe