eyelash serum

Back when I had thick and long eyelashes, people thought I looked pretty (?) when I used volumizing mascara lol

I used to be able to hear the sound, but at some point, my eyelashes seemed to become thinner and less dense.

So it doesn't look very good even with mascara.

I've heard that influencers also recommend eyelash serums,

Has anyone seen results from using this? If it makes my hair thicker, I really want to buy it even if it's a bit expensive.

I’d like to try applying it. If you know of any good products, please recommend them.