Hi Kannan Ganga.
Please go through the first part of the blog, where I have mentioned the eligibility criteria for doing the HANA certification.
My HANA Certification (C_HANAIMP_1) Experience
You can think about the HANA modelling stream.
Also, BW on HANA would be also be a good option for you, Your ABAP would be handy aswell.
Please let us know if you have any further concerns...
BR
Prabhith