Move the door and keep the nook.

You don't need to do anything special with the nook...a wall mirror perhaps.

With the nook you do wall art and have a large floor vase for decor

It’s going to be hard to park kids in front of the tv and sneak off into the bedroom.

Leave it as is, it will feel better as you walk into your BDRM. Alternatively, you could enter from the adjacent room - although I cannot tell what that room is without full plan. The alternate entrance would enable large furniture to enter the room without corner turns. Perhaps you can bring the wall out into family room to align it to the BDRM wall. Doing this and using the alternate entrance will open up you new space and wall options for the family room corner.
If the adjacent room is not appropriate as entrance, leave as is. Best of luck to you on your large project. Enjoy making your new space. It will be beautiful.

I like the idea of entering from the adjacent room. Center a doorway, split the walk-in closet into his and hers closets on either side of a short buffering hallway into your master bedroom.

Could you convert the measurements to feet and inches so we know what size spaces you are working with?
Is the lower right space an exterior area or patio?

I do no think your furniture will go into the room if you do the nook and really without seeing the whole floor plan it is very difficult to comment .

You can likely move furniture in through the sliding door unless there is a pool or something right out the door.

I am not a fan of master bedrooms - or any bedrooms - opening right off a common space like a living room but it seems common where I am for bungalows and bilevels as the lots are small and there is limited room to do otherwise unless you build up to a second story.

That said, I think you should keep nook to add some sense of privacy and reduce people seeing right into your bedroom. Hang artwork you like on the nook wall - it is something you will see a lot so pick something you like that can make the transition from common space to master bedroom more interesting for you :)

Thanks guys for your helpful comments. Here is the big picture of how the room is like. The measurement is in mm.

The master suite is next to a Rumpus and opens up to an outdoor living. So yeah all the big furniture can enter from the sliding door.

I wanna leave the rumpus as it is (without adding another door to it) but it is an interesting idea.

It is what it is. Make sure you sound proof that master suite. What about putting a pocket door where the original door is, and still have the other door to your room?

Our master bedroom double doors come right off our living room. That is no big deal at all. Solid wood good quality doors muffle sound. The bigger issue for us is sharing a bedroom wall with the kitchen🙄noisy as hell and you can’t sleep in if someone is doing anything in the kitchen. Glad we are creating a master suite on the other side of the house eventually anyway.