Hi,
Usually I have no issues grinding out all the challenges for the different tasks (Season, Campus Heroes, Game Time...).
Depending on what's needed and where stats count I usually use one of the Training challenges or play Solo Seasons (I don't have access to any of the online games).
Creating fumbles works well but interceptions...nope. Even after adding ST yesterday I didn't manage a single INT all day. I'm stuck at 4/10 atm and 3 of those came out of Solo Season games (Rookie, Arcade). I try to mix up different plays on defense that are popular amongst those who stream their games on Youtube etc.
Defense is 83 OVR and I'm still practicing to master the Switch Stick (not very successful yet).
Your recommendations are highly appreciated - thank you!