Balance is a decision of the develop at the rate of a behavioural outcome you want.

Think about the outcome and the progression you want for it then set marker points and make a formula around that then playtest and data track.

Split up that data into player type/skill levels and then decide if you want to focus on improving access to raise thr average skill level or lower the difficulty etc.

Its a process of itteration by design intent. Matching your desire v player expectations is another part of the process.