If I have a 457 and 403b plan with my main w2 employer (maxed 403b) should I start a self employed SEP/solo 401k for my side job (income 30k) or just use the 457?

I am a doctor at a large hospital system and do some medical consulting on the side. I want to reduce my tax burden. I have a 457 that I currently don't use at all and a 403b I maxed out. I want to know if I should bother with a SEP or something for my side consulting or just try to start using the 457 from my main employer