Our CL issues haven't been tactical though, they've been mental. Something bad happens, we don't get a penalty or we miss a penalty, or we concede one against the run of play, and then the team falls apart for 10-15 minutes and the tie is gone.
It's happened every season. Mbappe gets an early goal for Monaco and we shit ourselves, Liverpool score against the run of play in the first game and we concede 2 more in the next 15 minutes after going to pieces. Leroy's goal is disallowed and we go to pieces again.
Last year, we Laporte made a bad mistake, then lost his head and cost us another goal and the tie.
Tactics aren't the issue, it's reacting badly to things going slightly wrong and turning molehills into mountains.