I came back from a bunch of serious crashes. Surgeries.
One landed me in the ICU with head trauma.
Last April I broke my hand in a post race crash on the way back to the parking lot. I needed surgery, but all in all it was the most minor of any of my crashes. But it was the end of line for me. Why? Other than my family was a bit tired of me getting hurt, it's hard to say.
'Should I quit' is a tough question to ask others. Because only the individual can decide risk vs reward. People do all sorts of things others presume to be dumb or dangerous, yet it's where they find meaning in life. Until they don't. Then they find it hard to motivate/justify doing it. If you have something you enjoy doing do it. None of this stuff matters much beyond that anyway.
For me I took up less crashy disciplines. They also play to my secret desire to have an eating disorder.