I use manual focus and a focusing rail with my camera mounted on a tripod. Focus with the lens on the front part of the subject first and then use the rail to focus though the farther parts of your image. Good luck.
I'm a pro landscape photographer with over 4 decades of experience and I always shoot from a tripod using my viewfinder not the LCD. The biggest advantage for me shooting with a mirrorless camera is being able to magnify any area for critical focus plus I can check my exposure on a live histogram before I press the shutter.
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Have you considered either a Pentax 6x7 or a Mamiya RZ 67. I owned two of each and used them for many years as a professional landscape and commercial photographer.
I shoot landscapes as a profession and my main camera is an A7R111. I personally don't see enough value in upgrading just to own a newer model but you might be able to find a better reason than I to upgrade one camera for a v or iv. Good luck.