what are your ways to thicken eyebrows/ eyelashes?

manipis yung strands ng kilay at lashes ko kasi. yung tipong pag nka flash yung camera, nawala agad huhu any NATURAL ways to thicken them? ayoko mag pa microblade or lash extension kasi okay naman yung quality ng lashes/ brows ko. at natakot ako baka mag kamali hahaha yung thickness ng strands lng talaga huhu

does Castor Oil help ba? i've been using it for my skin.