Then I picked beehaw, because most of the communities I wanted to join were there. The signup form turned out to be an application form. I spent about an hour mulling over what to write there.
Once you find an instance you like (good ping, good performance, good admin) all the content across all the instances is there, barring any defederation. Which communities are local to the instance is not normally a selection criteria.
Bro this is a skill issue
To reiterate what I said in the last paragraph;
Not everyone is a writer.