Hi Deepanshu ,
The best way to keep in touch , in case your work does not involve using Excel regularly , is to join a public forum such as this , and start :
a. going through other people's problems , trying to understand them , and then trying to solve them with what ever knowledge you have.
b. going through other people's solutions to the above problems , to see how they have approached the problem ; not all problems are really Excel problems , though the solution may involve Excel formulae / VBA ; a lot of the time , solving a problem is a matter of using the right approach rather than having a profound mastery of Excel.
In addition to the above , the main aspect of your journey towards Excellence is that you allocate time to improving your knowledge of Excel every day , whether you feel inclined to do it or not.
Even half an hour is sufficient ; use this to :
a. Read at least one blog post a day ; there are any number of great Excellers who have their own blogs ; since you are not an advanced Excel user , you can always start with their archives , since these will deal with the simpler aspects of Excel.
2. Go through at least one Excel help topic a day ; in case you are a finance person , you can concentrate on the financial functions , if you deal in statistics , you can concentrate on the statistical and database functions ,...
3. Read at least a few pages of any good book on Excel ; a generally recommended book is Walkenbach's.
Narayan