Actually, there is one thing that a video game basically had as a storyline.
It starts off like this, sex dolls have been drastically improved, and unregulated. Incels would basically go extinct, as they now do have someone to care for, even if it is just a super advanced doll. These dolls will first drastically decrease the suicide and inceldom rates to almost 0, and roasties are no longer worth as much money as before. Foids now actually have to prove themselves worthy if they want an actual human chad, or simply get a Chad doll. Of course, we would still have to prove ourselves to human foids, but now the dating field is even. Male or female, if you want a human spouse, you actually have to put effort into it, as FDS is completely extinct! If you don't want to put effort into getting a relationship, these new and improved advanced sex dolls would be more than enough for you!
"Hey! That sounds great and all, a solution to our inceldom. But this is supposed to be about causing suicide rates to skyrocket, and this seems to have the opposite effect!"
Well, I am just getting there!
Basically, for some reason, the world governments end up banning these new sex dolls. I don't know their reason, and honestly, their reason won't matter, as the only thing these governments can do is unban the sex dolls to solve the new problem they caused. Anyway, to enforce the sex doll ban, all the factories are closed or repurposed, and making these sex dolls are far too difficult for an individual. On top of that, all existing sex dolls will be confiscated by the government. If you refuse, you will serve a long prison sentence.
Obviously, this will not sit well with the general population. Not only does this completely answer the question as to what will cause suicide rates to increase, as now a lot of people killed themselves, a lot more than usual. Like, I cannot exaggerate the amount of people if I try. The world population will basically suddenly lose at least a quarter of the population to suicide alone!
And it doesn't stop there. Terrorism becomes the new force. Due to these governments refusing to unban sex dolls, these terrorist groups are trying to attack the governments and make them submit. This is costing the governments a lot of money. And also, due to the fact that a lot of men killed themselves earlier, they now have to draft women into their militaries, and still not have what it takes to defeat these terrorist groups. The terrorists are so mad, they do not care what happens to anyone anymore. They are going to stop at nothing to fight the battle they can't win. They will never surrender. The governments will eventually collapse and only 1 billion people, at most remain. From there, society will probably start anew. And world history repeats itself.