How is it possible to reach the level of calisthenics athletes?

Hi all, after years of stop from any physical activity I've started again to workout in March 2024. I'm doing crossfit and burnit (a variation of crossfit without barbell which focus more on cardio endurance and compromised strenght exercises). I've seen huge results both with my performance and my aesthetic but the problem is that I can't do a single pull-up. I'm following a program to be able to do one pull up, but anyway I would like to understand how many years a person should train to reach calisthenics level. I really admire this discipline but I can't progress since I miss basic movements (I have few calisthenics app on my phone). Any advice? Thank you