Manchester City will undoubtedly defeat Bayern Munich in the return match because Bayern Munich's players are not as physically fit as Manchester City and scoring 3-0 wasn't something that Bayern Munich could easily recover from. Even if Bayern Munich were to score, I don't believe they would be able to score as many as 3-0.
I'm confident that Manchester City will still defeat Bayern Munich because they have excellent players who don't hesitate or make mistakes when scoring goals.
Greater chances exist for Manchester City to go to the semifinals of the Champions League than for Bayern Munich, whom they defeated 3-0 in their first leg match at the Etihad Stadium. The second leg of their next game at Bayern Munich's home stadium, the Alianz Arena, will probably be challenging for them. Bayern Munich could defeat Manchester City at the Alianz Arena, but I still don't think they'll pull off a miraculous comeback to eliminate them. Even if Bayern wins the game, it will be difficult for them to advance ahead of Manchester City.
All possibilities can still happen in the second leg at the Allianz Arena, Bayern Munich has the ability to make a comeback, but the opponent they are facing is too tough who is in his best form.
Bayern Munich have yet to completely merge with Tuchel's style, the defeat in the first leg means they are not ready for the quarter-finals. City will maintain the advantage in order to maintain the chances of survival in the UCL, Guardiola will make a surprise in front of the Munich fans.