I haven't tried recently. I always got stuck on the vibrating the tongue on/near the roof of the mouth. The technical term for rolling Rs is "voiced alveolar trill". I have tried a variety of techniques over the years and maybe it is time to revisit them again by trying out some Youtube videos. Right now, I just use the "d" sound as a substitute, as in a rapid "d-d-d" is an approximation of rolled Rs.

A few of my friends who know will tease me now and then by trilling their r's in conversation. It always simultaneously makes me jealous and in awe. I know that Spanish elementary schools have young students practice tongue twisters as maybe it is not a natural skill for all kids. "Un perro rompe la rama del árbol"

Perhaps related, I am struggle with unassisted lip trills [1] which is a key technique to improve your breath control/singing. Unassisted is when you don't press your fingers to your cheeks. I really struggle with unassisted lip trills and run out of oxygen quickly (5 seconds). The idea with unassisted lip trills is you can trill a song phrase on a single breath (15-20 sec, sometimes longer).

[1] How to do the lip trill https://www.youtube.com/watch?v=fwNPp-RS4IY