if you feel you my have shortcomings with the writing on the story, but want to be the sole creative, might i suggest looking for an editor? someone who, rather than giving input on the direction or angle of the story, simply helps you ensure a more cohesive structure. It would be stressed that they arent offering input into the worldbuilding or design of the story, just into the writing and word-choice. That way you maintain the prime crontrol of WHAT is in the story, but can still get help with keeping things consistent.
(of course I am just some rando from the internet who wants to enjoy your story, so feel free to ignore me. lol. just wanted to offer a solution that could maybe help lighten your workload. burnout sucks and yet its biggest ally is ourselves.)
Do whatever you feel is best for you. Hope everything works out!