The thing that got me over that mindset was really just being in the industry a while.
When I started out, I prided myself on going above and beyond what the client asked for. I didn't just do the brief, I went the extra mile! I wanted to make stuff that was totally unique! To be regarded as a brilliant genius, not just some hack!
The thing that changed my mind on this was discovering that the people who value uniqueness who I was desperate for the approval of were often self-absorbed jerks and nothing I ever did was good enough to impress them. They'd always just chortle and come up with some other thing my idea resembled, and they never read my work. They usually had a string of incomplete works with a very clever premise and very impressive concepts or early pages that they would then discard and never finish and just spent their time bitterly complaining about the "psh... popular artists who just draw shallow stories in popular styles." and as I got older and more experienced, I started to realise most of them weren't that original anyway, just edgy and making the kind of thing that plenty of people make but nobody reads because it's dull and pretentious with poor pacing and a shallowly misanthropic attitude.
The "hacks" meanwhile, the "sellouts" and "jobbers", the people who prioritised entertaining an audience and had the humble goal of paying their rent... they were generally much nicer people! Encouraging of newbies and forgiving of flaws, didn't think they were god's gift to comics, set themselves realistic goals for timelines, quality and achievement and then achieved and sometimes surpassed them. They went on to create large bodies of work, some of which was forgettable, but some of it was brilliant and memorable, and all of it was solid quality and finished. Instead of sitting around moaning about how nobody is ever good enough, they just made things and, looked at their mistakes, noted them and made more things. I inevitably came around to thinking "wait, these people are just way cooler and also seem to be living their dreams and happy for others to do the same. Maybe being a bit of a hack is okay?"
Remember this: Shakespeare never set out to make the most inventive, memorable work. Most of his plays were just adaptations of already popular stories, or they followed very stock story structures and were full of stock characters and tropes, and he made them to make money. The thing that made Shakespeare special was that he did an amazing job of it. He wrote the best versions of those stock characters and he gave them amazingly well-written dialogue, so memetic that Shakespeare quotes are common idioms, and hit the tropes so perfectly that they resonated for centuries. He wrote so many great plays that the less good ones are just kinda forgotten. Like yeah, The Merry Wives of Windsor and Caligula are honestly both a bit rubbish in my opinion, but the dude also wrote Hamlet and A Midsummer Night's Dream, so who cares if he wrote a few duds along the way and that his primary motivation was to get people packed into the theatre?
Instead of focusing on being uniquely amazing, first focus on being solidly dependable and able to finish things. Then you can start thinking about making and finishing things that are special and you'll have an audience to see you do it.
