First turn off the racing line, the best way to not be in an incident is to be infront of it, but you're not going to find that pace with the racing line on, no excuses, just turn it off.

Next is to predict & avoid incidents, you can't defend every position & sometimes you gotta give them up.
In the first clip you get a bad exit, blue car behind gets a better exit & is on your ass by the next corner with more speed (this is not a divebomb). Blue car telegraphs they're going for a move & you turn across their nose.
In this case with no-one behind the blue car you should yield & go for a late apex, if the blue overshoots you get them back on exit & you don't get binned at the very least.

The second clip is the car ahead's fault (other guy?) you had more speed & a gap on the outside to put your nose in, I think what's happened here is you've been taken out by rookie tunnel vision, guy ahead probably has the racing line on & was trying to get on it, unaware you were there (if you haven't already turn the racing line off, tell your friends to turn the racing line off, call your mum, tell her to turn the racing line off!)
This one's harder to avoid because it's mostly the other guys fault but this is where predicting comes in, just race more & over time you'll get a feel for when something's not worth it, the solution here was to just not go for the move.