in your opinion, what could've made A&O 2 a much better sequel?

Expand to a larger adventure I guess, and not be a "holiday film". It just doesn't sound right as "a sequel".

they should make a garth and lilly movie where they have kids of there own but the most important is that the movie should be made longer

Finished animation, proper character conclusions for King and Princess, a more exciting and less one-sided climax, more scenes with Lilly and Garth, an extra half hour of movie and a more proper ending. Really, how do they get home this time?

An entire society isn't going to simply change its entire infrastructure overnight. We need to see the aftermath of alphas and omegas being together. How do the other wolves react to seeing such a strange dynamic? Do our heroes feel the same way about getting what they wanted now that they HAVE it? Would the other omegas start feeling more entitled, and would the other alphas be okay with that? A better sequel would've further explored what it means to be an ALPHA AND OMEGA.