Asymmetrical lips and sagging corners of the mouth, can they be corrected with fillers?

I want to find an effective solution to improve my impression.
hello.

Every time I look in the mirror, I feel like my lips are asymmetrical. The corners of my mouth are drooping to one side, which makes my overall impression look gloomy or angry.
I become conscious of this every time I take a picture or meet someone.
I feel my confidence waning.

I would like to know whether the cause of this asymmetry and sagging corners of the mouth is a simple habitual problem or a structural problem due to imbalances in the bones and muscles, and find a way to naturally improve the impression accordingly.

By any chance...
I am wondering if filler injections can be effective in lifting sagging corners of the mouth and improving asymmetry.

Please give me some advice so that I can do well and walk brightly.