Go might be a good choice, but if you want to get into it, just stick to it even if something else comes along. But going deeper with Python is a great choice and you can pick up other stuff along the way.

I think, regardless of all of this you might be served to start a project you plan to stick with. Something you might want to see in the world. This will bring context and structure to your learning. If you have goals in mind that are separate from the specific tech, you'll have a better time discerning the options and making progress.