I can't find them. I only see a comparison table with words like "Excepcional (95%)".
I'm not a database guy. (I used SQL a few times (not in a few project, a few total times), but I used only single line commands that I can't remember, and I never used Redis.) If I were considering your project, I want to see a few runs of standard benchmarks with number comparing your projects and other projects. Bonus point for a script to run the benchmarks. Something like:
I'm sorry that I have no idea about the subject to recommend a few standard benchmarks, but if I were a DB guy and I were considering your project, I'd want to see a few clear examples with standard benchmarks and hard numbers.
There is a huge difference between freelancing and contracting.
With freelancing you go to sites like UpWork and seek out work.
With contracting you engage in professional networking activities, you identify the organizations that might need your C/C++ skills and then pitch to them. You build your reputation and portfolio of successfully completed projects.
Obviously, contracting requires more effort, but it also pays far better. For most of my career I actually had paid work for 5-7 months a year. Much of that time involved working 60-80 hour weeks with quite a bit of travel on top of that. During the "bench time" I would chill and network.