I think the problem can be boiled down to:
You've got talented wonder kids who could become good, but they're not there yet. They need time to develop, most of your players are championship level in terms of current ability.
Young players get tired really quick, having a wonderkid team when your trying to stay up is extra difficult, you'll need to throw cup competitions for them to get through the season.
You're in a relegation battle with pretty poor defensive players.
Biggest thing you can fix here you can fix is the players moral.
For the tactics, your set up to play like one of the best teams in Europe, try making these changes:
Take the Sweeper Keeper off attack
Midblock, with a mid defensive line
Remove play out from the back
Take off counterpress, you'll get exhausted and pulled out of shape
Keep Endrick on AF, looks like you're trying to counter attack and an AF role is perfect for pass into space
Fullbacks on attack instead of WB, they'll got forward on the counter and provide a strong defense
You're playing with 3 strikers. IF (s and a) and IW (a) provide almost 0 defensive help, tryand IW (s) on at least one side
Try a halfback role for the DM, he'll hold position (which the bwm won't) and help you transition defence into attack.
Benedetto looks like a weak Defensive Midfielder, I'd look to upgrade him for a hard hitting senior pro with good leadership in January. Check if Bodo/Glimt captain Patrick Berg is available in your save, he's a model citizen DM with great leadership who can bring a young squad together. If he's too pricy there should be plenty of old pro's in that model you can pick up for cheap.
Play more direct
CB partnership of a BBD and a CD
Avoid BBM and RPM (player has to be super to play them). Try out roles like mezzala (s), DLP (s), Carrilero
Hope some of that's helpful, good luck staying up!