I mostly work alone on my own programming projects as a hobby, but often come up with projects that are far too big to work on myself, so a few months ago I started searching for open source projects on GitHub that matched my interests and skill level. After doodling around on a few projects but not doing very much, I ran across a project that I used to use as a kid that is now overhauling itself.
After reading the contributing guide and looking around, I started to fix bugs that I found and a few other reported issues. I did this for about a week and every pull request I made to include the fixes (with rather detailed descriptions) was closed. I was told to make an issue for all of them, so I made issues for all of them, fixed the bug, referenced the issue, and submitted the PRs - only to be told that they really didn't want me to work on things other than issues with a certain label, "help wanted", which I am not good at fixing.
How can I communicate that what they have offered for me to do is not something that I find enjoyable or am capable of doing? I really like this program and would like to help out but I feel like I am not appreciated and should leave. Is this a situation where I should cut my losses and find another project?
Edit: This is my first non-personal project on GitHub so I might be going about this the wrong way. Are there any unwritten or written guidelines to follow when trying to join a project?