So recently I moved in Germany and my internet speed is around 10mb/s and I decided to get a better offer from another ISP in the same house while keeping the old one. The new one is 50mb/s. My question is if it is possible to do so?
Maybe. Games need very little bandwidth but unlike most other things they need both upload and download bandwidth. The vast majority of games need well under 1mbps of both upload and download.
It all depends on the mix of applications you have. Web browsing uses almost nothing. Things like netflix can use quite a bit of download bandwidth. Streaming or even video chat uses a lot of upload bandwidth.