Sure thing! I'll add you on Discord and we can chat a bit more there.

You can download any version of Godot without affecting previous or current projects. It will show a warning when going above the current version, or for going below the current version, denoted by a small triangle by the version number when you first open the engine. I have 4 different versions, though it's really just 2 versions but one with C#/.NET, the other Standard.

What would you be wanting to try and contribute? Just to get a picture of what you'd want to do with the project-to-be.