I'm thinking about getting fillers. How many sessions would be good? I'm curious about the recommended number of sessions.

Lately, my face looks so lifeless.
I'm worried that I look lifeless every time I look in the mirror.

The tip of the nose and the nasolabial folds look particularly sunken.
I am seriously considering getting fillers.

I'm scared of plastic surgery, so I'm thinking of starting lightly with a procedure,
I asked around and they said it’s not just a one-time thing.

Fillers don't last a lifetime once you get them.
I heard that I need to get touch-ups periodically,
How do you usually determine the recommended frequency or cycle?

I wonder if the recommended frequency or interval varies depending on where the filler is injected.
It seems like you don't even have the most basic knowledge.
I would appreciate it if you could reply, even with small tips!