You need to figure out approximately how much part of your salary comes from interest based income and get rid of that amount. Because Allah sets “cleanliness” as a condition to spend our earnings. He commands:
“Believers! Spend clean things from what you have earned and from what We have produced for you out of the earth. (…)” (2:267)
So you can use the remaining part of your salary while you look for other jobs.
Working in a bank can only be permitted on the condition that you look for other jobs, and be in a struggle for changing your job as soon as possible.