Restructuring finances for children

In broad strokes 48M, underemployed and not a hell of a lot of prospects for growing wealth or earning more.

I have one dependent daughter who is almost 18. No mother or family or grandparents in the picture, no spouse or partner either. It is just my daughter and I.

For argument's sake let's just say that I peaked a few years ago and the future is uncertain at best and likely continuing a downward trend eroding my limited meagre wealth even further. I have a house with maybe 200k equity, the rest (500k) is heavily mortgaged and student loan balance of 75k.

If I were to get sick or loose my job (or walk away to go live on a desert island) and I can no longer pay the mortgage. What could I do now in order of priorities for preserving capital and setting my daughter up in the best possible way for her future?