Hi Indradev,
I read your posts and the few responses to it. Just a take a few seconds and think about what you are asking, if there is such a module in SAP which is very easy to learn with minimal support from others and that gives you growth then don't you think all the people who want what you want would learn the same module 
, and so many people with the same skill will be available in the resource pool which will lead to less jobs in that area.
Regarding growth, you should know the place where your skills are needed and in demand, and also measure the depth of your skill. I know some people who started their sys admin/support work in Unix/Linux environment and got good appreciation for their innovative work.
What makes SAP more popular and attractive is that it has modules which are technical, functional and a few are both, so people from different background and experiences come to learn it and make a career in it.
You should take sometime and go through what BI/BO/BW are and see if you understand them and see that they will give you a good platform for your future.
HANA is new and there are many people who are learning it and going for certification for future implementations of it, you too can learn that and go deeper then many and make yourself a highly skilled professional in it.
Cheers,
Nagarajan Viswanathan