Hi All

I know every season that Players lose Star and I have a few that are Qlty 40 so will drop to 39.
Is best way to fast train and use Red Packs on these Players in first 3 days of season?
Or is Playing Friendly games better to get these to level up?
How can I tell when a Player is going to level up?

Will be Season 5 next Season, so want to try for the Trifector of winning it all!

Thanks in advance,