There are lots of blind corner solutions. Here are just a few:

https://mobile.kitchensource.com/lazy-susan/ha-548.10.230.htm

https://mobile.kitchensource.com/lazy-susan/ha-541.32.445.htm

https://mobile.kitchensource.com/cabinet-organizers/rv-53psp3-15sc-gr.htm

https://mobile.kitchensource.com/cabinet-organizers/rv-499-18-lwn.htm

Yes, there are all manner of blind corner inserts. Nobody can advise which is best for YOU.

In all cases you will lose some interior space, and while it may be more organized? The issue will still be there and that issue is INCONVENIENCE.

Seems you refreshed a kitchen......painted the cabinets? Show the whole kitchen please?

I will add that quite often, a rethink of what is stored where, based on how often you use it, is the easiest solution. They don't call it a "blind" corner for nothing- and add to the fact that drawer lower cabinets far exceed door cabinets for a reason.

Accessibility.

Curious about what is on the other side of the wall? Could the lower cabinet corner be accessed from the other side, like with a secret door? :)

Blind corens solutions are all about fit so you need to do some measuring and then a trip to good cabinet place that has access to many choices. I love Lee Valley for this type of issue. I do agree these are never ideal but sometimes can't be avooided. I like the idea of access from the back but we need a to scale floor plan for that. Pics of the whole kitchen are a must so post those here in comments along with the plan . All meaurements clearly marked and in jpeg format . DO NOT start another post.

I am planning on renovating my kitchen in the next 2 years, have been in my home for 5 years knowing that the day will come when my blind corner will go away. I thought about some of the solutions, but they are rather pricey. My blind corner cabinet has 2 shelves and worse than yours because the entry cabinet is only 12" wide. The 24 inches in the back are useless.

My solution was to place 4 12" wide bins in the cabinet with a few things I seldom use in the two non-accessible bins. When I need something from the bins I can pull out the direct access bins and pull the other one over or over and out of the cabinet.

It is an inexpensive, good enough solution.

Thanks for all of your information. Just for your quick info, these are my problem cabinets. Both left and right sides of the kitchen have them. 1st pic left bottom open cabinet and 2nd pic, same mirrored. Yes, it's a 12 inch opening and 2 shelf levels. The other side of the wall is a bedroom, or laundry room, inaccessible from other side.