SVBONY Telescopes Eyepieces 1.25 inches Eyepiece 68 Degree Ultra Wide Angle Telescope Accessory (15mm)

For a 6" F/8 dob, the 15mm from this set will be a nice eyepiece: https://www.amazon.com/SVBONY-Telescopes-Eyepieces-Eyepiece-Degree/dp/B07CCG5XN1?th=1 That eyepiece needs a longer focal ratio to perform well, which you have with your XT6. The focal length provides a nice general purpose balance of magnification and view brightness for many DSOs. That eyepiece is comfortable, has a wide field, and decent contrast and light throughput. Its major weakness is poor edge of field sharpness in shorter focal ratios, but at F/8 it's respectable.