As a tech lead too, I think getting a share of your company and be more involve for marketing side and success as a team should be a good answer.

Or you can try to work on the architecture and security of the code, which is more a strategic way of software.

If I understood well I would say that id depend on the medium. If I'm asking a question by email I expecte to have an answer in 2/3 days. But if it's a chat (specially a chat box) I expect it to be in a matter of minutes. The same for IRL, if it's letter I dont mind waiting weeks but in a line a few minutes..

I don't think it should be online/offline but more about the situation and the medium

This seem to be a cool thing to use. But I have to dig to find what is what about. I think it should be more simple with a clear slogan or USP

Thanks for your answer, how do you plan to achieve this ? Books, Online course, youtube, or anything else ?

What is Math ? Is it pure math like equation, regression, or something for space or data science ?

This is exactly what I want to learn x)

C/C++ for robotic, Math for data science and complex code/architecture for my day to day job.

Which books or online courses do you recommande ?

Thanks for your answer, what are you planning to do to achieve this goal ?

Nothing. I need my current job to support my family.