Pause and resume the download
Restart Steam
Restart your PC
Check your internet connection
Use a wired Ethernet connection
Stop other downloads and streaming
Close bandwidth-heavy apps
Change Steam download region
Clear Steam download cache
Limit Steam bandwidth settings to unlimited
Disable VPN or proxy
Update your network drivers
Temporarily disable firewall or antivirus restrictions
Verify disk speed and free storage space
Install games on an SSD
Change the Steam client to run as administrator
Reset your router
Try downloading at off-peak hours
Check for Windows updates
Reinstall Steam if needed