Top Democrat tells Trump and Republicans to ‘lawyer up’ after US midterm defeats
(www.theguardian.com)
It's typically an internal decision, but I think the legislators vote on it first thing after they're all sworn in.
You can certainly email/call your senators and representatives and let them know why you feel Schumer and Jefferies aren't right for the job, and suggest who you would like to see chosen for those roles instead.
It can't hurt.