Pause and resume the download
Change the download region in Steam settings
Clear the Steam download cache
Limit bandwidth usage in other apps
Close background downloads and streaming apps
Use a wired Ethernet connection
Restart your router and modem
Disable VPN or proxy services
Check for Windows updates and network driver updates
Set Steam bandwidth limit to unlimited
Change the download schedule to off-peak hours
Verify disk write speed and free up disk space
Temporarily disable antivirus scanning for Steam downloads
Restart Steam
Restart your PC
Reinstall Steam if the problem persists