as i said having a system could help to an extent. but we do lack quality. just check our players' performances with their previous clubs, neither of them were world class players then suddenly became meh. kostic, chiesa and vlahovic are all right, two of them started the season surprisingly well, we can't expect too much consistently from the rest though.
and you can't really teach balls to grown up people. guys like tevez, licht, mandzukic, chiellini (et al) grew them already before they became well known professionals. they could build some confidence through winning a series of matches, that's our best chance.