You can trim/tune the antenna in one of two ways: Either cut the wire or wrap the wire back along itself toward the feed point. I prefer cutting the wire for the very bottom of the band, (cw portion) then wrapping to shorten it to the voice portion.
Be sure the wire is routed through the insulating anchor before wrapping, and you may wish to use a combination of cutting and wrapping to carefully trim into just the right frequency without having an excessive wire wrap. In wrapping, be sure the wrap is as tight as you can get it in small loops back around the main radiator. Make it look like a small hangmans noose.
If you are now getting the lowest SWR at 5.8 mHz you will be reducing the antenna length roughly 39″ to get to the low end of band.