When would you consider it to be a good time to get another cat?

One of my cats passed away on the 12th of June and ever since my other cat has been very needy. He’s been wanting loads of attention, following me around, wanting to get into my room (was my other cat’s go to space), he’s back to pouncing on my 10 year old chihuahua (my dog doesn’t have teeth and my cat only does it when he’s playful), meows are louder, whenever he’s in my room he is always in front of mirror (rolling around and such which he never did), he’s overall been acting more like my cat who passed away…

My mom and friends say to wait but I feel like I should opt for a new cat sooner rather than later.
When would you consider it to be a good time to get another cat?
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