You may say the rewards for likes is what ruins Hive but I don't agree, rewards prevents sh*t content on Hive, and a minimum effort on content in most cases, which is why I deleted Facebook from my devices a long time ago, because I was tired of spending time laughing at nonsense memes.
If there's too low engagement is mainly because Hive is a very hard platform to understand and to get in. Creating an account is confusing, posting is confusing and takes time, understanding voting energies, HP, RC, HBD and HIVE currencies is super confusing. The most of the Hive DApps are not designed for common people, are designed for crypto-fans, and that's the main fault because social apps cannot depend in a so specific niche.
If we want Hive to grow and replace Facebook, we must make it a lot easier for everyone to enter and post here, otherwise this will keep the same.