Hi Mayur...
Should I go for certification?
Not Compulsory, but as per my opinion you should go for certification, you are end-user and there is major difference between running the transaction codes from sales order to invoice (OTC cycle) and prepare/configure these standard transaction codes with lots of validations & user exists as per business requirement with the help of abapers.
SAP Certification would give you a better marketability.
Is there a way to enhance my career in SAP & transform to be a consultant without the certification?
Yes its possible.You already have Business knowledge in the area of sales and distribution processing and you were part of support team so It is a plus point for you. 
Every day start reading sap help. http://help.sap.com.
What is the best available option @ this stage for me?
As per suggested by Mr. Sudhir Krishna Kumar Singh.
if you want consultant role, then you have to start from fresher level. 
I have grown up whole my life to ultimately be around engines, cars, etc. all the time. I would love to explore an option if I have, to work with an automobile company, manufacturer, etc. & use my skills in SAP for them.
Yes you can, if you are really passionate, no body can stop you to become a successful consultant.. 
Please go through with below blog it will clear all your doubts:
How to transform yourself from a fresher to an expert SAP Consultant?
Hope i have cleared some of your doubts.
Regards,
Meghna Jain