I'm a researcher (completed PhD) in CS. I have a very clear pattern: I can certainly come up with "punchy" sounding ideas, but they are suitable to write up a small workshop paper about but will never make it to a full conference paper. They're simply too impractical, they won't have real impact; they're not deeply theoretical contributions, but I also will not be able to implement my ideas enough to show (even for a paper figure) that they're potentially useful. It's more like a clever idea that someone will think "that's fun!" but no one would seriously encourage me to write a full paper on it. My research record is absolutely littered with such ideas that either get written up as a short abstract or (more often) get abandoned. A couple ideas have seemed more promising and those turned out to have been done already. If I pitch these ideas to potential collaborators/mentors I pretty regularly get shot down/discouraged from continuing to work on it.
I don't seem to be short on creativity or motivation, but I struggle very seriously to come up with any ideas that are both interesting and also suitable for a full conference paper.
I'm losing faith in my ability to be an independent researcher rather than just being known as someone who is good at executing other people's ideas. But I'm currently trying to address my issue by doing just this - intentionally focusing only on helping other people's projects until I figure out how to direct my own ideas in a better way.
Can anyone here provide advice on how to resolve this particular failure mode I have?