“You can’t find your voice if you don’t use it.” – Austin Kleon in ‘Show your work’.
To find what you want to talk about, and how you want to talk about it, you have to start using your voice. Doesn’t matter how feeble, someone would want to hear you. Doesn’t matter how amateurish, you might be just the level of expertise that can help someone. Doesn’t matter how niche, the internet will find you an audience that loves what you have to say.
Put your voice out there. Make yourself ‘findable’. Bring yourself more opportunities. Luck favors the brave, and the brave usually have something to say.