Career path

Hi,
I worked on donet for the past 7 years, mostly on desktop applications . I didn’t find any career growth with my projects.
I want to change my path by learning new technologies. Which option would be better python, cloud computing etc. Is it a good idea to change to updated technologies when I’m not satisfied with what I’m doing.
I have passion to prove myself as the best engineer.
Kindly suggest me. Thanks in advance