Here are some ways to help your cat urinate:

Increase water intake. You can add warm water to the cat's food, or feed your cat canned food, dried fish, or other foods with high water content.
Massage the bladder. If your cat's bladder is full, you can gently massage it to help them urinate.
Seek veterinary treatment. If your cat is unable to urinate and exhibits symptoms such as lethargy and vomiting, it is recommended to seek veterinary care as soon as possible. Treatment may include catheterization and intravenous fluid administration.