Performance marketing salary

For someone with 7 years of work experience, working in performance marketing (e-commerce), how much salary should be expected? I am trying to understand if I need to ask for a raise.

Current: 18 L at an MNC in retail.

Why is it that the salaries for folks working in digital/ performance marketing/ growth roles way lower than tech/product roles? In most startups the mktg team is lean and impact per employee is high. Yet there is a huge discrepancy in t...