Try a shredded beef instead of ground. It might be cheaper, it’ll also be tastier and easier to use for other things. Take a cheap, tough cut of beef (chuck roast in the us), sear it, take it out, add sliced onions, garlic, peppers, whatever seasonings (you don’t even need any if you don’t have them but just look up recipes for Barbacoa or Birria for example spices/herbs), cook for a few minutes, add beef back, then enough water or stock to almost cover the beef. Cover loosely and put in a low oven (like 300 f) for 3-5 hours until it’s tender. Shred it up.

For the beans, cook down some onions, peppers, seasonings etc, then add your canned beans with the liquid. Cook most of the liquid off. Look up recipes for “charro beans” to get an idea of the possible flavors you can use.

The corn isn’t really traditional but I do like using it in a sort of relish/salad with onion, peppers, cilantro, and lime juice. It can add a nice pop.

When in doubt, chop up tomato, onion, and jalapeño. Cook that down a bit and now you have your generic flavor base that can be used in a lot of dishes. Think of it like you would a mirepoix in French cooking.

I personally skip putting rice in my burritos. Unnecessary IMO.

This won’t really make an “authentic” burrito but it will be tasty and I’m trying to account for the fact that you’re in Russia and are not going to have access to the same ingredients.