I would need to see the whole main floor laytout o help at all. Is this the only PR I find it in a n odd place for a PR since guests would need to go past the garage entry and laundry room. You could puta couple of cabinets above the W/D and a counter over the W/D if both are front loaders but I can't see much space for anything larger for laundry unless you remove the PR

You can move the sink where the back door currently is and make the powder room 5 feet deep instead of 6’3” (or whatever clears the window. Then take out that too-deep closet and you’ll have an extra 2-3 feet in the laundry area for cabinets.

Do you need/want the powder room? Are you sure you won't miss the door to the backyard? @emilyam819 has a nice and practical approach. If it was for me my solution would be simpler- leave powder room/backdoor. Remove doors from laundry area and closet. Use front loaders, add counter above. Add a shelf about 12" above the counter. Add a hanging rod above for shorter garments. Use closet for hanging longer garments and additional shelves. This would provide the functionality I would need without a huge expense. Of course if you don't have front load machines now, that is an expense. But possibly not as much as closing off the exterior door and moving the sink and the powder room door. Good luck!

Refer to your other thread.

https://www.houzz.com/discussions/6228866/help-how-to-rearrange-laundry-and-powder-room#n=7

Be sure to place the dryer against an outside wall for a straight-shot on the exhaust.