Resigned without an offer !! Currently with 3.5 years of experience in SAP MM But want to switch to backend development

Hey all recently I have resigned from tcs,I have worked in SAP but I want to switch to java development. I’m preparing but feeling lack of confidence to give interviews. Is there anyone here like me !!! Let’s connect.

Can anyone help me with what kind of project should I build to learn the process ? It will be helpful to me. Thank