Why do you think some conspiracy theories gain more traction than others, especially on social media?

I think it is because social media is spreading faster and people believe what they see on social media more and more every day.

The more popular and discussed, the more traction they get

Some are more believable or even true. Some are so bad they become popular that way.

because some effect others more than other conspiracies

Because people are afraid and want to grasp at imaginary ideas in order to explain their problems.

Yes because many are questioning about the world itself and if we were the only ones to exist in this world we call Earth.