Robot Framework

In which situations should we use Cypress or Robot Framework? Are both good choices to get tenured manual testers into the practice of automating their work for tests of APIs and functional tests of web applications? Cypress looks great for functional testing of web applications and Robot Framework looks great for everything else.

Background: We have over a thousand functional test cases for our web applications being executed manually by a QA team. Our front ends interface with APIs written in Java with various frameworks over the years (e.g. Spring, Spring Boot, Java EE). I think our testers could learn enough of the basic coding in JS, Java, and Python required to automate most of those cases.

Is it acceptable to compare CodeceptJS with Robot Framework? What are the pros and cons for them?

Jest and Robot Framework are both named 'Testing Framework' on many sites that I visit. Both aim at testing the client-side of a web application.

I am aware there are differences in their implementation (JavaScript vs Python) and their purpose (Unit test vs Acceptance test). Still, they seem to overlap a lot. Is there a use case to implement BOTH testing frameworks? Suppose a team has written lots of Jest test cases, and code coverage is really good. Is there still a reason to add Robot Framework on top of that?