SQL Boot Camp

Moving Careers from Data Warehouse ETL Testing to DW Development
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I have 4 years of experience in DW ETL Testing (manual testing). I am kind of bored with the Testing Career now.

I am good in writing SQL queries .
I know the DML part of SQL as well.
I am good at data analysis
Now I am being offered with a role of DW ETL Developer in the same project. Shall I go ahead and take this DW Developer Role?
If I accept this opportunity, how would this role change my career?
What are the long term career oppurtunities for a DW ETL Developer( especially the for the one who comes with a Testing background)?
Please help