I think it is normal. I have tried to find other creators or content source, but the topics I care about (mostly engineering and education) are under-represente

I think it is normal. I have tried to find other creators or content source, but the topics I care about (mostly engineering and education) are under-represented on Bluesky. It is probably due to how Bluesky was populated - a specific demographic of twitter were the first movers to bluesky, and it has attracted more of the same. I guess there is a market for this. As a side note on Thread and Mastodon: the experience there was different. Thread has a larger tech community so there is actually interesting content (for me at least) and Mastodon, it really depends on the instance, but even on the first instance (mastodon.social) you can find good content if you search by hashtag, and you can find some real nice people to follow (and since it's the multiverse, you can follow from any instance anyway) so it's all about building the social graph you want)