I was a pro at bubble lettering 40+ years ago and my book covers were works of graffiti art. Since computers became the norm my handwriting has taken a huge hit. I’m not sure this is bubble lettering so much as it is penmanship. I mostly wanted to learn more tricks with Procreate. 
My creation tool of choice is Designer. I have been trying to create more with Procreate but so far there’s not much I can do in it that I can’t do in Designer.

I’m going to make another one but work more on bubble letters.  (and here it is)