Best time to sell players and should i buy new players ?

[Sachin Bankar]

3. If they are your best players, you should keep them as subs or reseves, sell weaker ones and buy 5 stars, depends how much tokens and money you have.

currently i have 5.5mil cash and 12 tokens
yeah they are my best players and i was thinking the same.
Will sell my subs/ reserves who are 3 star and will buy 5 star players