Gear advice for an iceland roadtrip?

I am travelling to Iceland next week for a road trip around the country.

I have some experience with wildlife photography, but this is my first time trying to shoot landscapes and also taking shots of my parents in front of landscapes.

I currently have an A7riii, Sony FE 100-400mm GM, Sony 1.4x teleconverter, and a Sony FE 24-105mm f/4. I do want to be mindful of budget and space.

Is a 16-35mm worth picking up? What about a wide angle prime lens? I do want to be mindful of budget and space.