Nice job. I had a quick play with your photo in Lightroom - it looks pretty good with some adjustments to white balance, contrast, clarity, and sharpness (some granularity is visible).
Without knowing more about your set up, the blurriness may be due to a combination of factors:
* mis-focusing - I find that zooming in using LiveView mode with manual focus to be the easiest option,
* optical distortions from your filter welding filter,
* lack of sharpness and/or diffraction from your lens - most lenses are sharper with the aperture set to 1-2+ stops smaller than wide open, and the latest Canon crop cameras tend to blur from diffraction at f/8 or smaller.
Might be worth practising/test without the solar filter on terrestrial scenes or the moon to see how sharp a photo you can get with/without the filter.
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