This isn’t an issue to solve. It’s easily done by changing a single number in the source code.
The limit is there basically to ensure quality of service.
Unless you really know what you are doing and have setup a serious server (cluster), anything more that 20 simultaneous users is unrealistic, especially with the new simplified php version.
However, I am really wondering who sets up a home system with more that 20 simultaneous users? That seems already like a high limit even for most small companies.
And if you need more than that, you should really first learn a bit more about servers and how to do simple code edits and recompile a webapp 