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Just spit balling here.
That broken part appears to be an alignment pin Used to align the door to the B pillar when closing.
That needs to be replaced.
If you look closely, the lower striker pin that seats into the B pillar is what mechanically latches the door.
Suggest you try cleaning and lubricating the striker and catch inside the B pillar.
Also, I believe that bulk connector on the door needs to make clean contact with its mate on the B pillar.
Make sure contacts on both halves are clean and repair the protective boot.