of course , the best one is sell all your team at the end of season and get 3* player insteed. but we're not always do this. Each person has his own strategy, i 'd like get some discussion may be we 'll find something new and applicable for our situation
i go first:
Main team : my team now compose of 5-6* player. each season, i bough some scout and some 5* near 6* player in TM and improve immidiate my team 5Q in first 2 day of the season. So, my team isn't far from the other but i'll get fair chance to win if i have better tactics
Sub-account= 50T team (i watch some video but it can reduce to 35T if i don't help main team train young player).
I try to get promoted every season. but only active in tranfer market only 1 season/2 season. ie i won't buy any player in one season and sell half of best 11 at the end of season. and don't add any skill for them. Next season, 2*player will automatically add to the team and i bough player 15 better and have very good chance to win the cup. with 100T i can bough 10-15 decent 5* player (26-30 yo) and imidiately improve my 11 best player about 12Q. this season you have also good chance to win the league
the most difficult thing is get promoted next season after the season you win the cup with only 4* team. What level this strategy still working.