Eyelashes are so thin and brittle!!

Im sure many people have asked about this before but...

My eyelashes have become so thin on the left side. They started thinning/falling out around valentines day, I tried a new mascara and ever since they've been like this! It was a tubing mascara, but I'm not sure if that's the whole reason.

Now, I do curl my lashes after mascara 🙈 I've never had many problems around it though. It never rips my eyelashes out, and my lashes have never been damaged/cut off from it. But, recently, when I go into curl them, one always comes off. It doesn't get pulled; it's like it breaks?

Ive been trying to use the velour lash serum, and I think it's been helping a little bit, but i haven't seen recent improvement. I was thinking about trying the elf lash serum?

I can't take a break from curling my lashes. Should I take my mascara off the second I get home? Please offer any advice possible!!!