Very confuse about career progression

Question

I am working in one of the leading IT industry since last 5-6 years. I worked as business analyst for 5 years and now moved to application support - SQL. I am good at programming and since its a long time i have not practiced any of the programming languages, i am bit confuse now that should i brush up my existing knowledge or should i learn new technologies. I know C, CPP, Core Java, C sharp, SQL. Please advice...