So this might not be the most helpful answer, but I think there have already been some great suggestions (monster hunter world and dragons dogma are both awesome).
Granblue Fantasy Relink, it is possibly the game that ticks every box. Has a single player story and is full of dragons and demons to kill, you are recruiting your crew and gearing them up for massive fights, it has some fantastic combat(had platinum games help on it).
The biggest downside is it isn’t out til February, but there is a demo on Playstation 4/5 if you have one to try it on, unfortunately PC not getting a demo.