Actually you can edit your original post on this forum! You can't on Trip Advisor but this forum is easier. If you want to add a time frame you can, and I would recommend you just make a note that you are editing.
You can play by ear how you do your lunch and Napoleon's Tomb. You do not need reservations to visit the Tomb or the rest of the Les Invalides complex (if you have an interest in the Army Museum) nor to enter the Rodin Museum so that part of your day can be fairly flexible. You will want to get a timed entry for the Orsay.
Not knowing what your budget or other requirements are, if you want to stay in the 7th in the Rue Cler area, I am partial to Hotel Muguet and Hotel Relais Bosquet. My other go-to hotel is, in my opinion, in need of a top to bottom cosmetic reno. It is also less expensive than the other 2. It's clean, just very tired looking inside.
Just something to remember when you do the Louvre. Once you get inside and under the pyramid, you go up escalators to the 3 different wings. Your ticket is scanned when you enter each wing and you can only enter one time thru the main area. You CAN go from wing to wing within the ticketed area, if that makes sense. So...if you start in the Denon wing, see the Mona Lisa and French art, you can move thru corridors to the Sully wing without having your ticket scanned again. If you are planning a long visit there are a few cafes WITHIN the ticketed areas but there are more choices if you move back out to under the pyramid which would require you to scan your ticket again. I'm just telling you this so you figure out what areas you might want to concentrate on and work out a preliminary plan.
Here is the floor plan of the Louvre:
https://api-www.louvre.fr/sites/default/files/2024-06/Web%20-%20EN%20%20LOUVRE_PlanG%20-%2004-2024.pdf
Here is the list of what galleries are closed on certain days of the week:
https://www.louvre.fr/en/visit/list-of-available-galleries
The Orsay building is not as big or complex since it was a train station in it's former life not a royal palace, lol!! My best tip here is when you enter, walk straight back thru the sculpture toward the back wall. Veer to the left and find the hidden escalators that take you directly to the 5th floor and the Impressionist galleries (if that time frame is of interest to you!). If you enter at the time the museum opens and hoof it to the back you will have a few minutes alone in these upper galleries before people filter up there!
No advice on Versailles...The last time I went I was on a Rick Steves tour so it was guided within the palace and then we were set free to see the Trianons, the Hamlet and the gardens.