I stopped using Facebook and Twitter. Same as majority of people who did the same, I report being happier and more productive.
In the meantime, I've made it my job to gradually unlike and unfriend nearly everything, which has been made much easier and apparent by the fact that Facebook now shows what other things people have in common with you. (too little too late, mark)
But for Twitter and Facebook I found that as long as I unfollow people, mute certain words and otherwise weed out the garden, I am more relaxed, more informed about people I do care about, and I get to see more cool stuff.
I ask because I've never felt that social media has made me unhappy (beyond some "FOMO" from seeing cool stuff my friends are doing.)
If you are implying (through the use of "proud of x, [but] happily doing y") that this is some sort of contradiction, I challenge that implication. WhatsApp and Insta are entirely different products by the same company, which scratch different itches. Not everyone changes their social media habits based on a perception of moral failing by the company that purveys those services -- that appears to be something rather unique to a subset of individuals. Some people just want to be happier.
Potentially viable alternatives (Telegram, Signal, etc) are emerging for Whatsapp compared to none for the other two.
Edit: for Android devices, Signal is just as easy to use as WhatsApp.