1. Does it offer significant technical advantages e.g. easier to learn/deploy/ more powerful/ quicker?
2. Not sure of it's market share, does it attract many jobs and projects and in which sectors?
Thanks
With .NET and React in your toolbelt, you already got easy to deploy, powerful and job market. What else do you want? :P
Could always try out F# if you think the grass is greener out there.
If you already are experienced with Node & Java, I doubt it is worthwhile for you. Just keep gaining experience there, I don't see Django overtaking any market anytime soon. It's a niche compared to others, but there is a lot of work in building microservices and API's. As a junior & freelancer, there is no shortage of work for me. Sectors range from API's to pure backend service & DevOps automation. Purely backend jobs.