You need work on the same thing most people new to singing (serious singing at least) need. You need a exercise routine that addresses pitch, tone, placement, and breathing issues.
Once the foundation is set, you need to start incorporating some style, which can be taught and or learned. This could be something like screaming, changing up your tone, doing vocal runs, etc.
You need to get a coach either in person or online, or buy a singing program and work hard with it.