Grey scale , Jarvis or what

I would like to burn this file but am unsure if there is a proper way to do this to have a good outcome
I have converted it to greyscale the outcome is acceptable but it takes 2 hrs to burn. I tried Jarvis and it started to look pretty good but then it started to shade where it wasn’t supposed to.
I have downloaded files that were labeled 3D and burned excellent and fast. Is there any way of converting this file to something that will burn clean and be reasonable in time. I am at the end of my pay grade. I just thought there may be a way to transform this image into something other than what I can do
Grain Farmers-1

Delete this one because you submitted another. However, you could have edited this one to add the image.

Closing this because of the duplicate. thank you, @MikeyH

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