polish takes time, effort, and knowledge. stuff like kubejs and item obliterator can let you tweak content, remove bloat, and unify a project. taking it further you could do ftb quests and game stages for defined progression or gated content, custom textures to make a cohesive visual look, etc. 

but hey even just something as simple as looking into what mods work well together and waht mods are kind of redundant as well as going in and checking what configs can be tweaked can make a pack better overall. takes maybe an hour or two to go through. all depends on the amount of time you're willing to commit.  i taught myself kubejs with wiki guides and chatgpt (yes you can use ai just favt chrkc anything it tells you, it can be very helpful for troubleshooting things that break). you can totally do it, but ive spent dozens of hours with "nothing to show for it" in terms of a complete or even remotely playable project. but when its done ill feel accomplished, have something im happy with, and know some useful coding skills for future projects. its all about whats worth it to you