VPN stopped working on Warzone

I recently bought a PC and decided I wanted to play on American servers (I’m in the UK). I downloaded ExpressVPN and was able to play about 10 matches until it stopped working. I tried reinstalling the VPN, restarting my router, and repairing the game via Battle.net. Then I downloaded NordVPN and still couldn’t find a game. Is there any solution to this?

Thanks in advance.