Young devs are rarely great POs/marketers. Hell, we’re even rarely even great devs.

And the reverse is true:

• if you start by being a dev you probably suck at marketing/business/law. It’s fine, you’re young.
• if you start being a marketer you probably suck at tech (at least dev) and law, perhaps even business.

And so on for every skill. Be curious and learn at the previous jobs.