Bismillah Hir Rahmaan Nir Raheem
As Salaamu 3laykum,
I hope you and your family are doing well. If you avoid the major sins then Alhamdullilah you should be good for the rest of your life. The following hadith states:
Verily the Messenger of ALLAAH (ﷺ) said: The five (daily) prayers and from one Friday prayer to the (next) Friday prayer, and from Ramadhan to Ramadhan are expiations for the (sins) committed in between (their intervals) provided one shuns the major sins. (Muslim, Chapter of Purification)
Furthermore, the main ticket to get into heaven is the kalimah. The belief in One God without any partners and to believe in what was sent down (Quraan). And everything else that comes with the revelation. If you do not believe in it 100% then you are an unbeliever. Sins do not make one a unbeliever however, it inches towards disbelief and lowers your spirituality until you come to gates of leaving Islam. May ALLAAH (Glory Be To Him) protect us all. Ameen.
Have a Nice Day!
Note #1: If you downvote my answer, please be courteous and say why you downvoted in a comment below.
Note #2: This is my own personal answer that I have derived from what I have researched.