Turn Off Your VPN
Your VPN may be also causing slow Steam downloads. You can try turning off the VPN connection completely or excluding Steam from the VPN tunnel. However, by doing so, you may lose access to exclusive content.
If you don't want to miss anything, you should try a VPN that works better for online gaming. You can refer to some specialized services such as NordVPN, CyberGhost, ExpressVPN, Hotspot Shield, Private Internet Access, Surf Shark, VyprVPN, PureVPN, Ivacy VPN, and Opera VPN