See primarily there are two major varieties of consultants for SAP.
While dealing with SAP UI5 you come under a technical consultant and it is the same journey which everyone knows like an sr consultant, Lead consultant ...
SAPUI5 works on HANA and you don't actually have to work a lot on SAP ABAP as UI5 is nothing but a bunch of WIZIWIG controls, which I don't think people will face many difficulties in.
The point is that I needed to focus on is that we tend to not become better only during a specific technology like only webdynpro, only CRM, only adobe forms, etc.
As a technical advisor, you don't retire with a technology from that you've got started thus please don't stick solely to UI5.