If your payments are not being made through the probation department, you will have to start a lawsuit by filing a motion to increase the payments. There may be forms available, but it would probably be helpful to consult an attorney. When circumstances change such that it is no longer fair or reasonable for you to pay the same amount. One of the most frequent changes is retirement. If your final judgment of divorce does not take into account this event, you may need to make a motion to the court to modify your alimony obligation.
Many courts distinguish between voluntary early retirement and mandatory retirement.
If a person retires at age 55, the court might deem that to be a voluntary retirement that does not justify a change in alimony. Regardless of whether you are seeking an increase or a decrease, you will need to show a significant change in circumstances affecting your ability to pay. Therefore, it made sense that alimony would end when she remarried because now she had another caretaker who was able to support her. The general principle remains that once a recipient of alimony remarries, the need for alimony disappears. If you could talk your spouse into it, you might be able to reach a settlement that provided for alimony to continue past your remarriage.