If you're land poor you're still rich, because you've still got some place to go. I would spitball a hundred ideas for raising cash and put land at idea 100 and fill in the other 99 before you get to selling land.
Garage sale
Seasonal job
Organ donation
Cable bill
Thermostat
Gas bill
Vacation bill
Eating out
Clothing bill
Giving plasma
Sell firewood
Pawn your cavalier (I've pondered that one)
Weekend roofing jobs
Eat sunfish
Change withholding on your paycheck if you get large refunds
Up your car insurance deductible
Sell your rider and buy a push mower
Develop a craft (build things, fix things, flip things etc)
Invest in a speculative upstream oil company. I'm up a negative 54% on mine right now.
If it's just habitat projects, you can get a lot done with little money if you go about things the right way. We've got our hands full trying to spend $700/yr on habitat projects. And half of that was renting the skid loader for a day and running out of projects after 6 hours in an 8 hour rental.
Learn spray and pray.
Learn cover cropping species and how to manage them with no equipment.
Learn to graft. (I'm midway through my experiment of 50 cent crab apple seedlings and $7 in protection to create apple trees. Not ready to crow about this one yet...)
Start with a chainsaw. Lots of habitat work can be done with a good saw and $6 worth of fuel.
Don't sell for sake of raising cash. Way too many easier ways to raise cash than to get your land back.