Buy or sell? End or beginning of season?

[FC Barcelona]

I´m a light T-buyer (have around 493T on my account), so buying/selling isn´t a big concern.
I already sold mostly of my players during this week, but I´m gonna try to buy 2 or 3 players tomorrow morning after the daily maintenance.

Here is my current squad.

seriously? you really play with 3DC with no DMC? this idea really scare me