I have recently concluded some independent work (algorithmic) and, since the results seemed to merit it, wrote a paper about it.
As an independent author without connections to academics or other experts with detailed knowledge about my paper, I tried to submit my paper to two different journals. The first rejected my original draft and after significant rework I attempted to submit it at a second journal.
After reading the abstract, the second journal actually invited me to submit the paper, only to reject it as well.
In the meantime I tried registering at ResearchGate, only to find out that since I am not associated with a research institution, I cannot join as a researcher but just as an interested observer.
I still believe my paper is valid and could be published. But I honestly do not know how I could have it reviewed and improved to a point so that I can re-submit it.
In other words: can anyone in this community give me some pointers as to how to improve my paper and/or validate it?