Pictures would help
Sometimes back teeth didn't erupt all the way and braces can pull the teeth down, resulting in normal looking teeth and fixing the overbite. Sometimes the back teeth are worn down and need to be built back up. This means you need to see an experienced cosmetic dentist or Prosthodontist for evaluation. This can be very complicated and not all dentists can help.
Can I make tiny teeth bigger?
Porcelain restorations can easily make teeth bigger in different ways. Once a proper physiological correct bite has been established, your new porcelain restorations can be made into that perfect bite!
It is very difficult to try to understand what you are interested in doing without a photo of your teeth. I would suggest you contact a good dentist in your area and have an evaluation done. They can give you your options. I'm afraid we would be guessing and you deserve a better answer than that. Good luck!