One is either choosen and called by God or they are not. If you are called you belong to Him. If not then you don’t belong to Him. This was true for Israel as it is the church.
It’s that simple but people sure have a way of making it complex.
You won't get an argument from me about election during the Church Age. However, I do believe there are other periods where free will is the guide. The millennial reign is one example that comes to mind.
Please read the next thread in this series about Acts 1:6. I think you might find the argument interesting.