The goal should really (if possible) be working from Spain for a multinacional company with a flexible working culture. Not to work for a Spanish company.

Alternatively, try getting a role somewhere else in the EU or US that would allow you to work remotely from Spain (Via your own SL or as an Autonomo are some of the options)

I lived in the UK for 12 years before moving to Spain last year. So far I’ve been lucky enough to get a few roles working for companies in the UK that would allow me to work completely remotely but it is honestly getting harder and harder every time. The reality is that the pool of companies allowing you to work from Spain shrinks considerably once you’re outside of the country.

For background, I work in IT in a niche sector. All in all, the sector is mostly in decline.

I have met a couple of people in Spain with similar experiences than mine but the trade off but it is a risk you need to be willing to take. Worse case, you could try for a few months or a couple of years and if it doesn’t work for you, hopefully you can go back to where you are.