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You could probably look at Facebook for a case study in this.

• Take away the ability to choose the sorting method for your feed
• Basically never show you content from people that you follow and instead flood the feed with suggestions that go into adverts that go into more suggestions that go into more adverts
• When it does finally show you something that you've chosen to follow using your own brain, ask "aRe yOU inTeReSteD in ThiS cOnTEnt?"
• Make sure that every redesign is to the benefit of advertisers and not users

Facebook is still pretty widely used in my country. But even the people that use it say that it's gone to shit and complain about never actually seeing their friends' content anymore. But they still use it because there's nothing to replace it with yet. Not everyone enjoys forum style or microblogging style, so it is what it is. Keeping an eye on Friendica currently to start suggesting to people but in its current state, I'd say it's still not shiny and polished enough yet to get non tech enthusiasts to switch over.

I think generation gaps are the trigger. Kids don't want their parents on the same platform so they jump.

I need a little more context for your question. Are we talking about what might Google fuck up and break their stranglehold on people fully enmeshed in their ecosystem? Are you talking about what can a user do to de-Google themselves? Or are you thinking about a regulatory framework to prevent user capture? Or something I haven't thought of?

if a bunch of bots joined people wouldnt like that much

If they, say, stopped showing you posts from your friends in favor of showing you posts that made you angry to bait you into interacting. You know, hypothetically someone could do that.

For public fora: get the annoying ultra political people on it.

For more private platforms like whatsapp or discord: no idea. Better technology maybe? Discord replaced mumble for that reason.