The films do a great job portraying a grounded and believable Magneto... but after Thanos, I wanted to see a version of him as the jaw-droppingly powerful omega-level mutant he is.
Leaning into a more comics-accurate look helps create a more bold take without going full rivet-necklace - though I may try that too.
As a way to integrate him into established narratives and increase his threat level, I've armored him with repurposed Stark nano-tech he magnetically controls.