1: Open task manager find anything related to riot client click on it then end task
2: Check if your valorant is running as admin
Right click>> properties>>compatibility
3: Win+r then type %localappdata%
Find riot games folder and delete it
4: open command prompt as administrator and type these commands in order one after another.
netsh int ip reset
ipconfig /release
ipconfig /renew
ipconfig /flushdns
netsh winsock reset
netsh advfirewall reset
reboot the router
wait for it to get connected to internet
then reboot the pc