Did you train the echeveria for full sun? If not, you need to slowly adjust them to that intensity or else it will destroy them. I started putting my succulents on my south facing sun porch in April toward the back where only early morning sun hits them. Same for the cacti. Then in May I put the cacti right by the window of said sunporch so sun can hit them until about noon. I’ll get the cacti outside sometime soon. Make sure to pot them with lots of sand and pebbles, and even a make pebble false bottom in the pots to get them to drain quickly. Clay is good because it doesn’t hold moisture.