Hi Amit,
if you have sound kno. of oops then you can built your profile of SAP ABAP OOPs, also there are other areas in addition to core abap(RICEF), like Webdynpro, IDOC, workflow, either of these you can choose and then become a proficient. In addition to core abap if you you any one of above skills thne you can stand out of crowd. core abap+ abap oops is good option for you.
Regards,
Hitesh