Should I continue to use the Legendary Hero Set?

As useful as the set was for me personally, I eventually opted out as my character grew slowly I just came across tiny, and affordable nick nacks that helped more collectively than the set except the medal which is very helpful with +8 to everything but you don't have that I would assume since you're missing the Shoulder Decoration. I would go shopping, minimally and save for when you're a higher level. I didn't start getting major equipment until 14x~