6 frame run cycles are hard! But not impossible.
I recommend you use this image as a guide, only look at the odd numbered frames

The important moments are:
The first connection with the ground, this one is kinda present in yours but not very extreme
The release, the last connection with the ground. This one is not to be found in your animation
The jump position. The odd numbers from this guide would suggest that it is also possible to leave it out, and go with a mid contact position instead, but I'm not sure how well that would work with 6 frames.

I tried to do a quick fix on your run, but there is little I could do quickly without redrawing the whole thing from scratch
