Correlation != Causation

I invite you to scientifically work on this important topic. Catch up on previous work by others and then use a proper statistical methodology to do proper research and validate your hypothesis.

Other possible factors that could explain it apart from your theory on SSRIs: more exhaustive news reporting, less wealthy parents and thereby more kids brought up in poverty conditions, more parents with lead poisoning, more kids exposed to plastics, more weapons per household, more exposure to violence and/or mobbing, violence in video games, less third places that kids have for socializing, more social media, more mobbing at school, more unrealistic beauty standards and many others. Some of them might've been researched already and some might not.

Even though you're not trying to do a degree you can always do proper science and maybe also prove a novel explanation.