Then there is the issue of buzz word bingo with resumes and HR departments. But that might be a subject for a separate post.
Pxsant, I did some checking on Indeed.com. I don't know where you would recommend to source your leads for opportunities for the kind of campaign you're describing. Indeed.com seems as good a place as any to start.
When I'm on Indeed what I see is:
Any tech skill you want to mention is dominated by body shop listings. A FEW major employers advertising directly.
I've found that lacking the mix of alphabet soup listed in the job ad, you don't get any opportunity to talk to a human to do what you're saying.
That by itself messes with my motivation to try what you're saying. I know factually that placed in a real task environment, I may run rings around any real human. But I'm going to be weeded out long before I get that opportunity.
The body shops and most Fortune 500s won't even talk to you unless you fill out a lengthy Taleo assessment. (Note to older workers who haven't interviewed for years; Taleo is the main HR platform that forces the applicant to fill out a detailed item by item application for a job that usually takes 30 mint to an hour.)
Then (and I have found this out directly) even when you meet the job's likely needs, you don't get a call back when you have a problematic current bio (too many years since FTE, non verifiable experience with clients or employers long out of business, small shitty companies that are unknowns, etc.)
Suppose you progress to talking with someone.
They'll ask where you did this and that and who they can ask about you. NOT about what you can actually do. Again, it's not about what you can do for them, the process is still in this "we need to assess your merit" phase.
Ok, suppose one gets past this phase:
Back in the 90s, I really knew my shit about Windows application development on C++, VB and Delphi, and HR software wasn't in wide use. I almost
always crashed and burned on the interviews that were more formal and structured.
The places I was actually able to get into were the small biz shitholes that had no formal interview process. Which is why I was always complaining about my clients.
Now, that's really my own self esteem, salesmanship, and self worth issue that I fully own and it's all my fault, I realize.
I'm just saying that even when I was at the top of a particular area of expertise with a lot of current work to show for it, I would get dissed down to nothing and rarely got invited for a follow up. That was in an area I already knew.
Tooling up on a completely new skill and building some app to show it? Maybe there's some new weird current dynamics that make that feasible but I never got that to work.
Lastly, you're saying it may take many tries. That's true and I tended to give up after 5 successive failures in a given niche.
I'm probably more persistent in the face of really discouraging odds than anyone else on this board currently.