Take advantage of the low and buy large coins like BTC and ETH

I would like to rely on the experience of those who have been on this path for a long time. I'm new here and I'm sharing my portfolio to better understand the situation. I know that low periods are normal, but how do I know that the choices I've made aren't exposing me to greater risks than I should? This is the first time I have faced such a significant fall and I would like some guidance.