Look. Even your brain is just an organ and so it can adapt to demand—to a certain extent, however its actual limits are debatable. Right now, it is only used to do what you use it to. When you try anything more demanding, it’s almost as if you physically feel its pain of incapacity, but so much only for the first time you try.
Yes, try learning new things; as things you might not believe you could eventually master. (Pick something you would really love knowing or being able to.) Get introductory tutorials and go really slow; make sure you grasp one thing before you move to another. Repeat. Don’t let yourself be put off by initial difficulty.
If you persist, you might slowly feel a kind of “lightening up”. You might eventually surprise yourself by approaching even everyday little “problems” in new and ingenious ways, stunned by how “stupid” you must have been not seeing those solutions previously.