I think the real core value prop of Twitter is the niche communities people can build around their interests. It's about the interest graph. I posted this in another article on the front page today, but I'll do it here also. I think they need to double down on growing communities within Twitter. It's just too hard right now.
Here's my proposal:
Twitter Rooms: https://medium.com/@danielrakh/twitter-rooms-e6f34e843e9a