My Steam didn’t download a game, so I switched between servers that are nearby. Unfortunately, this didn’t work.
How can I allow Steam to download games using maximum speed?
The only times I have had issue with download speeds with Steam have been when their distribution servers are heavily loaded, issues with the ISP, or the terminus. The last two will affect all Internet traffic though, not just Steam. Any other Internet usage from the home network will slow Steam, sometimes to a crawl, so look at that first. Also check the speeds of other Internet applications, services or sites. If you are getting crappy download speeds from speedtest.net with no other usage from other devices running through your router/modem, your ISP may be having issues.
perhaps to uninstall seam application and reinstall?
Go into Steam > Settings > Downloads. Make sure to select an appropriate download region and no download restriction is set (Limit bandwidth to "No Limit")
Now, unless the Content Servers are overloaded Steam will always try to use as much bandwidth as possible.
The "limitation" then comes from any other software, tool or device on your network.
For example if you are watching YouTube videos at the same time some bandwidth may be used up by that. If you have multiple devices on your network the speed mostly depends on how your router/modem distributes the bandwidth e.g. via policies, QoS or at random.