There are a number of potential reasons why your cat may have stopped purring. It is important to keep in mind that each cat is unique and may exhibit different behaviors for different reasons. Here are a few potential explanations for why your cat may not be purring anymore:

1. Health issues: If your cat is experiencing pain or discomfort, it may be less inclined to purr. This could be due to an injury, illness, or other health condition. If you suspect that your cat’s lack of purring may be related to a health issue, it is important to take your cat to the veterinarian for a thorough examination.
2. Age: As cats get older, they may become less vocal overall, including in their purring. It is not uncommon for older cats to purr less frequently or to stop purring altogether.
3. Stress: Cats may stop purring when they are feeling stressed or anxious. This could be due to changes in their environment, such as a move to a new home, or the introduction of a new pet or person into the household. If you suspect that stress may be the cause of your cat’s lack of purring, it may be helpful to try and identify the source of the stress and take steps to reduce it.
4. Illness or injury: If your cat is experiencing a respiratory infection or has suffered an injury to its mouth or throat, it may be less able to purr. In these cases, it is important to seek veterinary care as soon as possible.
5. Personal preference: Some cats simply purr more frequently or loudly than others. It is also possible that your cat may simply have a personal preference for when and how it communicates through purring.

If you are concerned about your cat’s lack of purring, it is important to observe your cat’s overall behavior and health. If you notice any other changes or abnormalities, it is a good idea to take your cat to the veterinarian for a thorough examination. Your veterinarian will be able to help you determine the cause of your cat’s lack of purring and recommend any necessary treatment or management.