It's not you - it's the printer!
The M3D Micro is not a very sturdy setup. The X-axis is a single pair of thin rods, hung up on a pair of similarly thin rods in Y and mounted on 3 very thin pillars in Z. While the idea is good, the execution is not particularly well: The rods are too thin and the design is virtually unchanged since 2015 and thus this review ...
Once a time, it was the same with me, I sanded the surface well and continued for a while without any problems. The only problem was the sand pattern that was always visible in the bottom of models and finally I upgraded the bed to PEI sheet.
If you have tried every trick to remove the print, you probably need to replace the build surface. If the PLA is "engraved" into the build surface, your surface is damaged anyways, just replace the surface, or remove the top surface and buy a sheet of glass, preferably borosilicate.
It appears that there are several issues with the prints.
First layer too far from bed
The picture showing the bottom of the print clearly shows the deposited lines and gaps in between the lines. Please re-level the bed to get the print nozzle closer to the bed (usually a sheet of paper should fit between nozzle and bed without too much friction when ...