What products do you use to grow/maintain lashes?

I have been using the cosnori lash serum since November. It worked really well for the first month but it started going downhill from February. I lost 3-6 lashes PER clip PER lash when curling my eyes now but I feel so ugly without doing it lmao. What should I do to prevent this?? Might stop using the serum as a first step because nothing else has changed in my routine and I only ever use gentle mascara