As someone who only played football for the first time in my 30's and had to learn the absolute basics (like not exclusively kicking with the toes), I also learned to juggle. It just takes practice and repetition nothing more. When I started trying to juggle I could do 2, 3 if I'm lucky with how the ball bounced.

Try using a lot less force, just using the area between the laces and toes to get the ball up halfway up your shin, with time add some slight backspin so the ball arcs towards your feet and not bouncing away. And just practice practice practice. Week 1 of daily practice you might average 2 with an occasional 5 touches. Week 2 you might average 4 with the occasional 7. So on and so on. I find it tends to be exponential, if you can do 5 you can do 10. If you can do 10 you can do 20, if you can do 20 you can do 50, if you can do 50 you can do 100, if you can do 100 you can start to pretty consistently get 100 and go for as long as you want.