There are sites selling repair parts for higher-end blinds. Cheap ones were not intended to be repaired and I agree with Cindy on those. Here is a site to guide you:
Our 14 year old cord controlled blinds are all giving us trouble with raising and lowering and tilting. Many of the top mechanisms are coming unglued from the top. I ...
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If the mechanism is broken, you will need to replace the entire unit.
There are sites selling repair parts for higher-end blinds. Cheap ones were not intended to be repaired and I agree with Cindy on those. Here is a site to guide you:
https://www.hunker.com/13413568/how-to-repair-a-vertical-blind-tilt-wand