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Well, you don't have to develop your themes. This may have been a "necessity" from, say, 1700 - 1900, but in the 20th and 21st century lots of music isn't based on theme development anymore. (Very often there aren't even any themes either.) There's nothing wrong per se with just repeating a "theme", just jumping to a next "theme", just having the piece end after the "theme" is over, making it ultra short, etc. Of course, you should be aware of the effects these "techniques" may have. You don't get processual music like that, but (especially in the case of direct repetition) a very static one, and even just jumping from one idea to the next can give a pretty static impression, as there is no "logical" flow. Also, in that latter case it may be hard for the audience to perceive the piece as one whole, if there aren't any parameters that strongly bind the piece together. (Of course, this approach may be valid too.)
But I understand your problem very well. I also struggled quite a long time with making compositions longer than half a minute. So I did just that. I wrote two cycles of piano pieces of which each piece only has five bars or so. Ultra short. I'm still writing more such piano pieces from time to time, and I enjoy doing so, and I find nothing wrong with keeping them at their "natural length" without needlessly making them longer. Even Schumann wrote some extremely short pieces which have basically no development going on, but are more or less just one single idea brought to paper.
Of course I'm also writing longer pieces, but they don't tend to be built out of themes or motives, but rather some general underlying ideas and structures that hold the piece together and allow me to "draw" rather free musical lines above them.
But I realize that nothing I said really answered your question of how to develop motives, just ways to avoid doing so.
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