Do you think that blockchain is a niche by itself? Really facing issues into understanding what niche I should go to and having anxiety of letting go of clients on the way.
In the case of blockchain, the answer is almost certainly "yes."
But then, what do you do with that topic? I can, off the top of my head, think of a few things:
- Teach general "intro to blockchain" courses - Teach developers how to use the blockchain - Help companies develop blockchain-related apps - Help companies optimize blockchain-related apps - Help companies secure blockchain-related apps
Note that I know almost nothing about the blockchain, and I was able to come up with a few niche-related services you could offer. I'm sure that someone with more knowledge could come up with better, more appropriate ones.
Or, better yet: Ask friends/colleagues working at companies using the blockchain what their problems/bottlenecks are. What problems would they pay money to get rid of? Whatever they answer is your opportunity -- and if multiple people give the same answer, then you should grab it.