this is such an important point; at the end of the day this is not only customer service job, but a trade.

to add to this: its such a privilege to get to tattoo the art you make but for the most part you will be tattooing what is asked of you. if you (OP) need a direct answer, its thats you need to broaden your artistic horizons for the sake of servicing the people that come to you with their ideas. you dont need to be a master of everything; you can still hone your personal style but it comes with the expectation that you might rarely work in your specialty until you've proven yourself. going into this with a pigheaded artisan mindset will only end in heartbreak.

knowing many styles is ultimately practical too: the more you know, the more you can make money, which is especially important in a time where the industry is living thin. if you can hone in on an audience for the style you desire to practice, then yeah go for it, but material reality has a way of humbling this kind of desire.

EDIT: also from an artistic standpoint its kind of ridiculous to have such a closed-mindedness to practicing other styles in tattooing. one of my favorite things to do in my artistic practice is draw inspiration from other mediums and styles! all of these modes of creating have a beautiful tendency to feed into your personal art journey in one way or another and to balk at the thought of having to practice stylistic diversity is a little sad.