Recently problem occurred where the navigation links seems to be missing

workaround:
my-career area appeared after removing setting in roles and workset; 


1.login as admin; goto 

Portal content
content provided y sap
end user content
employee self service
custom content
my career

workset mycareer ->  select properties -> goto leaf folder and click no;


2. .login as admin; goto 

Portal content
content provided y sap
end user content
employee self service
custom content
roles->  ESS -> click on the workset my career inside roles and select properties ->

goto leaf folder and click no


Conclusion make sure both are sync-ed
Last and not least if you want fast results
goto system administrator
-> navigation -> navigation cached and clear everything