I did the same. Mexico for a couple years (I love Mazunte and Zipolite!) then Guatemala and Chile. Actually moving back to Toronto from Guatemala in a few days after almost 5 years to work with a startup there.

The thing I've found most effective to combat my own burnout has always been a change of scenery and behaviour and getting a fresh perspective on my work.

I would recommend heading somewhere nice, warm, and cheap, and finish your project from there.