Step 4 - Case study was based around increasing Revolut's revenues. You need to ask them about revenue streams and how they would want to increase the revenue (i.e. acquire new customers or offer more services to existing customers). The revenue streams they will give you will be (Card swipes, monthly premium membership, stock trading and FX). They will explain that they want to offer more services to existing customers. You should ask them the % numbers for how much revenue each stream generates and what the margin on each is to identify growth areas. From there you need to work on strategies on how you would select the target customer base to encourage existing customer to use stocks/fx (these were the ideal two from what I gathered through % the numbers).