As far as stack, get great at AWS. Learn the ins and outs of as many services as you can. Learn IaC like terraform. IMHO Someone who knows AWS + can write glue code + decent at python is probably the most widely applicable to the largest variety of jobs in tech.
This must be specific to your area of expertise. I've been in the industry over a decade, and never have I conducted or been a candidate in an interview where Python was used.
As long as we're contributing anecdata, 9 yoe on the hiring side, almost all interviews have been in Python, especially for interns. What's interesting is the company where I was at for the majority of, their main stack was Ruby, and they respected new employees' intelligence enough to assume they could just pick that up after being hired.
If you're not pedantic about the syntax, Python, and it's libraries were great for interviews. I did a handful of them in Golang, using the same question, but there was always a time crunch because Golang required more boilerplate (for the particulars of the question).
I am assuming Python is the "Schelling Point" of companies in the US tech centres.
To be clear, my anecdata is that Python is the language of choice for candidates for the kinds of roles we were hiring for - I can easily imagine that a game studio would have C++ and Lua overrepresented.