Heading to Chiapas in November

Hey all. I’m 34m heading to Mexico and Guatemala in November and am looking for any recommendations on food and budget friendly accommodations.

I will start with a few days in Mexico City before flying to Palenque before making my way to San Cristobal and surrounding area. Hoping to take public transportation across the border to Lake Atitlan.

Has anyone done this border crossing recently and have any tips?