Is it permissible to make up for all prayers from previous years, including those that were performed, due to irregular prayer and not knowing which prayers were performed?

We ask Allah to grant you success in repentance and to keep you steadfast upon it. Making up deliberately missed prayers is a matter of scholarly disagreement, and the majority of scholars obligate their make-up. You must ascertain, to the best of your ability, the number of prayers you missed, and pray what you predominantly believe you missed. If you doubt the number, then take the more cautious approach to absolve yourself, and you are not obligated to pray all the prayers from previous years.