As an algebraic topologist who did not even touch anything less “pure” than PDE during my master’s degree, I would say the following: You have many possibilities, but you might have to rebrand yourself a little.

I went into a government job (DM me for details as I am already too identifiable). I was really unsure about going the PhD route or not, and ultimately opted for what I thought would make me the most happy. I am pretty sure it was right for me, though it is a little bittersweet in retrospect.

In my opinion the people matter more than the place, and with sufficient freedom and autonomy a mathematician can make any task interesting. Think about how you can make your skills useful for other things than pure maths (in a manner you could also enjoy) and sell yourself to an employer on that premise.

LunarVim is dead I think. In the issues section the (main?) dev says they recommend switching to something else and that they have gone over to Astronvim.