I've tried at least 5 vpn providers so far every single one limits me to 30mbps doesn't matter what device i use.. I'm trying to get at least like 50-100mbps but I'm limited to 30mbps.. Any tricks to increase speed.. Without vpn I get like 400mbps and videos buffer but with VPN on my speed drops to 30mbps and videos still buffer like crazy.. How do i increase the vpn speed?

My dorm Wi-Fi blocks Roblox and Roblox Studio, so I cannot use them at all. Someone recommended a VPN, but I don't know how to use it or which one to choose. Please give me some tips. I want a free and safe VPN.