The phrase "much persistence" means consistently trying hard and not giving up. It is about steadily working towards a goal despite challenges or setbacks. Full definition
After much persistence, it has become much easier as she has gotten older (this probably started around 4 months). (babywisemom.com)
It's no wonder that today's biotechnology graduates don't understand just how much persistence and optimism the job market requires, or why. (sciencemag.org)
My breastfeeding journey with each of my children has taught me so much persistence, patience and tolerance. (breastfeedingsuccess.ie)