Need career advice

I'm currently working in ICICI Bank as an affluent relationship manager (DM2) for 6 months now, having a CTC of 6.8 lpa. I'm a bcom graduate from a tier 2 college. I'm planning to resign in April '25 and the notice period is 1 month. When should I start applying for new jobs if I'm gonna finish serving my notice period in May. And what kind of jobs can I look for having experience in the banking sector. My current role is associated with sales which I dislike the most about my role. So I'm looking for a role in operations and finance. I'm okay with working in non banking sector as well. What should be my expectations for my next role? How much hike can I expect? Should I try going for higher studies instead of a job change? Or should I prepare for any competitive exams?