YNAB sounds like an awful lot of work to keep up with, as well as costing money. Could you really be bothered with it?
You mention a cycle of saving and borrowing. What are the things that cause you to use up your savings? You may find a lot of them are expected expenses that you need to plan for, such as replacing white goods, car repairs, etc.
So many people mention that they have no money due to 'an unexpected car bill' but if you have a car (or washing machine, pet etc) you should expect to spend money on it sooner or later, so need to save money for this.
So make sure you put away money on payday for all annual and irregular expenses like Christmas, insurances, car bills, white goods replacement etc. This is more important in your budget than day to day spending.
Also, see if you can download a few months worth of transactions from your bank account or credit card, to see where your money is going except bills. Look at the average weekly/monthly supermarket spend over the past few months, same for petrol or other transport, clothes, leisure spending. Put it all into a spreadsheet and add up all the categories.
Think about where you spend your money, the information will already be there. Eg if you regularly buy coffee or lunch, that's where your money is going.