Peace be upon you. If you are unsure about the number of missed prayers and are uncertain whether it is fewer or more, you can suffice with the certain amount you know you missed, and you are not required to make up the uncertain amount. This is according to Ayatollah Sistani's guidance. Similarly, Ayatollah Khamenei states that if you are unsure whether you missed two or three prayers, you can make up the lesser amount that you are certain you missed. May you continue to be successful in all good.