This is one of the turns off of WvW, is the progression of the character and account in general with the Reward Tracks are far too slow to the point of feeling more grindy, and many of the LS tracks are very lacking in rewards outside the final reward, which makes the grind of these tracks more noticeably annoying.
My suggestion is speeding up the progress of the Reward tracks and making them less grindy. Add more ways to progress these reward tracks, because not all forms of combat in WvW seem equally as rewarding. I can Treb down a Keep wall in SMC and a tower or whatever and get barely any track reward progress at all.
Maybe reduce the amount needed to progress, or make the smaller rewards on tracks seem much more worth the grind rather than the thing at the end being the only meaningful rewards.