Be willing to stand back and simply service the song and groove, it's not showboaty like other instruments with some exceptions. One of your biggest jobs is to simply give the band a bottom. Study the masters of the instrument within metal like Geezer Butler, Steve Harris, Lemmy (keep in mind how deeply unorthodox Lemmy's bass work is, he plays it more like a rhythm guitar than an actual bass, nonetheless, a fascinating style to study), Dave Ellefson, Glen Benton, D.D. Verni, Jimmy Bain, Cliff Burton, Robert Trujillo, Rudy Sarzo, Peter Baltes, Jeff Pilson, Al Cisneros, Frank Bello, Jeff Walker, Ian Hill, etc. Study minimalist bassists too, like jazz and Motown session bassists, it may not seem like much at first, but keeping that sort of stuff as an element of your musical style and knowledge will service you and your playing more than you'll ever know. Learn how to add some bump and funk to your playing too, percussive thumping is cool, but if you can make the song groove or boogie, it'll be even better. Glenn Hughes is a good one to study in a rock/metal context for learning to do that. Play around with syncopation and various rhythmic structures.