Trending @Capgemini; Enhance Frontend Skills

Hi dear CG mates, I am a frontend developer in SAP with skills SAPUI5 and FIORI. I wanted to enhance my skills, but I ain't ready to learn backend coding. Because, at present the backend is SAP ABAP and OData, but is being migrated to SAP RAP soon. So, if I wanted to learn backend I need to start from scratch which may lack and takes more time, so instead of learning backend what else can I proceed my learning with. Currently I started with SAP CAPM, you can suggest any other which can help me with, if the backend completely changes to SAP RAP.