Get a homebiogas.com methane bio digester and turn your shit into natural gas to cook and heat with. If you're the only one using it, you may find you need more people contributing more shit to your shitter pretty quick, though.

This design would be standard practice for every septic tank if the regulators simply got out of our way! 

 🤔 

 You can find DIY designs to fabricate a methane bio digester out of an IBC tote on YouTube. Those can be fed scrap compost run through a garbage disposal. Might also consider setting up a BTC space heater to get some sats-back on the electricity spent on your electric heater.