Java spring boot design pattern for incremental application

need some help on how to design my application. So we have a UI written in Angular and it has a flow to apply for something. On each page we have some fields which we want to persist/update to database each time user presses next button on each screen so that the user can later fetch and edit the application. We are using a spring boot application to do it which exposes a rest interface for the UI. We are interacting with a legacy database and there are 5 tables in which we have to submit the data to. Someone in my team suggested to use CQRS but I am not 100% convinced.

Thanks heaps.