Most websites say 3-4 days for pretty much everything. I push it to five pretty regularly.

ask.usda.gov/…/How-long-will-cooked-food-stay-saf…

www.mayoclinic.org/…/faq-20058500

Is buying an auxiliary freezer an option? Freezing is the simplest way to preserve. Home canning is also an option for some foods, but it’s really important to do it correctly so that you don’t get a much more dangerous kind of food poisoning (botulism) and requires some expensive gear (pressure cooker + accessories + a lot of cooking fuel/electricity/what ever powers your stove).

To keep fridged foods fresh as long as possible, chill immediately after cooking:

Get ice paddles or use an ice bath (float a smaller metal mixing bowl with food in it in a larger metal mixing bowl or plugged sink full of ice water).

Don’t put your hot cooking pots directly in an ice bath or they will break or warp.

Don’t put a big pot of hot soup in the fridge or it will warm the rest of the fridge for hours, making other things in there not stay fresh as long.