1. Check how stable your internet is — maybe you’re connected to the wrong Wi-Fi network and getting a third of the speed. For faster downloads, use a LAN cable.
You can check your speed on dedicated websites — for example, 2ip or Speedtest.
2. Check whether other programs are eating up all your bandwidth. Maybe you’re seeding torrents or downloading a large file at the same time.
3. Turn off your VPN — when you use bypass tools, the speed definitely drops.
4. Check that the right download region is selected — not to be confused with your account region.
The file you’re trying to download may be coming from distant servers, which is why it’s slow.
In the top left corner of Steam, choose “Settings” and click “Downloads”. In the “Download region” section, choose the nearest region — a VPN may cause a different one to be shown, so traffic takes a detour and is slower.