I think you would trade off massive flexibility for any increase in salary and not necessarily find WFH. Sounds like you are in middle of nowhere-ish; so there is the potential of increasing driving which is fuel, maintenance, depreciation - this can all account for several thousands of dollars per year. You working from home is a benefit that saves on those items. Don't underestimate the ability to be home and what time spent commuting could better be spent doing.

If there isn't necessarily money for raises, look for other ways to be compensated; an increase in PTO or personal days, for example. Those have a value.

It sounds like you really have an ideal situation. For me, I'd need a significant, ridiculous raise to give up all those soft benefits. I don't think it is possible. But shop yourself and the market. If you like your job, get creative about extracting more value on good terms.