Who knows, but honestly you’re probably worrying too much. The human brain is extremely elastic. So read a book, keep a journal, draw a little picture of a house. You’ll be okay :)

I think it is!

Reading is another thing that can help a lot (comics included), and basically any handcraft. Anything that makes you struggle a little bit

To answer the second part of your question, yes. Improv is good because it forces you, not an external source, to process a set of information quickly to fulfill a stated goal. It is also good for working on public speaking and interpersonal skills.

I knew one engineer who took improv as a way to improve interpersonal skills and to be able to respond faster in client meetings. When talking to them and they brought it up, I responded “Yes, and?”

Admit to yourself that there is no rot and move forward.