All you can do is mine who you are.  As a writer that is all you can do.  You are who you are.  And that is where your get your material to write.  We are all given a tiny piece of the universe.  It is small but that is what you got to work with.  We all think a little differently.  Each person is a “snowflake” and that is what we have to mine as a writer.  We can not portray ourselves as we are not.  Then it comes across as being phony.  We are ourselves for better or worse.