Looking for a new nickname that stems from my birth name

So I've never really liked my name but over the years as I've explored my gender identity, it just doesn't feel right yknow? I don't want to fully change my name because that's a whole legal ordeal but like a new nickname that feels more like me sounds like a step in the right direction. I've always gone by Bella, but my full name is Isabella Marianne. I'd really appreciate some help with finding a new nickname that feels more gender neutral, maybe even masculine.