You have a beautiful sunroom. Just change the floor and the fan, along with the wall paint and select your furniture. Here is your room with a variety of vinyl floors so you can see the effect. I replaced that fan with something that blends with your ceiling. Instead of shiplap, I would recommend adding simple batten strips to your walls

Batten Stips on your walls for the 'farmhouse' appearance. Less expensive and easier with the angles on your walls.

If you add an area rug remember some of your flooring will be covered.

Beverly! This is amazing!! Thank you so much for taking the time to help me! What are battan strips? Just a different type of wood plank? I'll look them up! I'm so excited tosee this!!

Why not just update the flooring and lighting in the sunroom and then add furniture and decor. Below are two sunroom designs by designers we follow,

Watersound Beach · More Info

Luxe Living in Zionsville · More Info

Angelica, thank you on this whole new perspective! I love the cozy/warmth of both of these pics. I'll definitely look into how I can potentially change it up this way. Thank you again!!

Whatever treatment you decide on I’d just do the inside wall.

Board and batten

Shiplap

If were me, I’d just redo the ceiling and paint the walls a fresh white to go with the ceiling. The metal frames should be painted white as well and use an appropriate paint.

In regards to the floor, a light and wide vinyl plank flooring would be lovely if your style and furniture would suit.