I download a file from my own Google Drive. Or you can also try downloading a big game from Playstore like 'Call of Duty Mobile'. Another thing you can do is try downloading from Youtube if you have IDM installed.
I'm on 50Mbps plan and I do not get more than 50Mbps on Google servers (Not while downloading anyways), sometimes it does go around 60 - 65 Mbps while streaming from YouTube but not while downloading from Drive or YouTube. But I do get 2x the speeds on Fast.com and Steam.