Highest performer, lowest paid. How to handle?

I’ve been the highest performing senior analyst the past 2 years out of 5 other seniors. The other seniors responsibilities are essentially just updating files each week. I swear one person does nothing but updates 1 file once a week. My responsibilities are more quantitative and analytical in nature, and involve more ownership and mathematical skill. I’m the quickest to respond to messages and emails, and routinely turn around fire drill requests quickly with minimal direction at this point.

Unfortunately I’m the lowest paid senior. Everyone has within 1 year experience in the current role. Other seniors are making up to $9k more than me. My annual raise is only 1% more than theirs. It’s impossible to catch up to them. Moving into a manager role would put me at the lowest end of the scale due to caps promotional raises. Any advice on what you think I should do?