What should I do before re-entering Thailand on a retirement visa that expires soon?

The user is currently on a retirement visa expiring on May 28th and plans to travel out of Thailand at the end of the month, returning in May. They need to obtain a re-entry permit before leaving. Upon re-entering, they will be allowed entry until their current visa expires. It's advised to apply for a new one-year retirement visa before the current visa expiration. Previous commenters confirmed that as long as a re-entry permit is obtained, the user can re-enter on the existing visa terms and should prepare to prove income for the renewal.