If you are uncertain, perhaps one extra factor to consider would be the future earning potential.

I am in a somewhat similar situation (albeit considerably older, almost 41) and still considering my options. I have used plain PHP + MySQL to build web applications in the past but I am now trying the same with Python's Flask and liking it so far. Later down the road I'll either try Django or go fullstack Javascript (Node, React, Express, ...) because it is in such a high demand and not going anywhere.