And still, after two years, much of the content is about crypto, which no-one is truly interested in.

Couldn't agree more. Google Trends are supporting us (Cryptocurrency):

throughout the existence of steemit user engagement has gone up and down with the price of steem

Demonstrable truth as well, there were 3 peaks:

That being said though, having seen 3 years of this website, it is not dying

It's definitely the best part! I'm very happy to see many die-hard platforms, https://www.erepublik.com/en for example, lasting for more than a decade.

Hopefully, Steem(it) will pass the test of time as well.

Thank you for your comment, it gave me some topics to think about