RapidLash is an over the counter product that you can find like at CVS or Walgreens. (assuming you live in the US)
It'll lengthen your eyelashes over time, you can also use it on your eyebrows to make them grow out.
I did that for a long time before HRT, that way I'll get the full testosterone boosted effect of bushy eyebrows lol.
That way I could make them any shape I wanted to.
Olive oil will make your eyelashes healthier and softer, thats for sure.
I'm not sure about making them longer X:
You can also get eyelash extensions.
I know it sounds a little weird, but I got mine done twice in the past.
It was only 15$ and they came out amazing.
They lasted for about 3-4 weeks.