Act 6 completion

Hello fellow summoners, once again I am asking for your help with a new topic being the initial clearing of act 6. I fully explored act 5 and finished act 6.1 and now I’m thinking of pushing for thronebreaker but I’m not sure my roster is good enough. I have 4-5 mvp champs but I promise this isn’t a roster flex I’m just asking for help because I haven’t played the game in over a year and some new champs I have no idea if they are useful or not, please guys help me out if possible. Thanks in advance for everyone