I'll agree with adjusting the mirrors. The best way to adjust them is to find a time when you're at a stoplight with cars in both lanes behind you. Look in your center mirror and note the last car you can see in the adjacent lane. Now adjust your mirror on that side so it overlaps the center mirror by just a bit. You'll find that the side mirrors cover the blind spot perfectly. If you turn your head to look in the mirror then the car will be entering your peripheral vision as it leaves the field of view in the mirror. (another method I've read but haven't tried is to put your head against the door glass and adjust the mirror so you can just see the side of the car.)
I've had my mirrors adjusted like this for 30 years and find it far safer.
Tesla's blind spot camera system is all they could do with their hardware but is mostly worthless, IMO. It forces you to look away from the road, down at the screen, particularly so when merging left which is also where your blind spot is biggest. The angle and field of view of the cameras is difficult to visualize and adjust to and the image is regularly blocked by your hand on the wheel. The glare from the blinker also makes it virtually useless at night There's a reason that the only other carmaker that used this system phased it out a few years ago. There's not much else Tesla could do without changing hardware, so I can't blame them for it, but it's not very helpful, either.