Make solid tried for weeks

Happy Thanksgiving
i I have tried for weeks on and off to turn this heel into a solid
I have solid inspector and
the findings are just impossible with 1800+ problems
Can anyone help me to turn this heel into a solid
to subtract from a block like an negative sculpture of it
ANY other higheel would do
This one if from a shoe in the warehouse that found before
and asked this question
Since then I managed to delete all the rest of it and the invisible geometry.
The only way around it I can imagine is to create vertices that hit the heel at many spots
but it feels like it will be an enormous amount of time
I also tried to thicken the top to close the heel but somehow can’t make it part of the group.
It always stays separate.
Maybe some one on here has a extension
that does this in a jiffy?
Thank you very much
HEELonlyRED.skp (1.2 MB)

You have multiple groups and some very strange shapes, and you have hidden all your edges rather than softened them, and other things.
I haven’t used any fancy extensions to fix it, just basic tools.
HEELonlyGucciRedBox.skp (888.6 KB)
And your edited file
HEELonlyREDBox.skp (2.6 MB)

Hello Mr Box

Thank you so much for your time and effort. I
GucciRed.skp (9.9 MB)
This was the original shoe from the 3Dwarehouse
So all I did was delete and delete and try solid ware.
Now I have this but how do I show the filled shape of whats of the side of the shoe
the heel in the back isn’t vertical so I can’t push back with push and pull
I send the logo that I wanted to achieve ±in 3D
like a solid block where the high heel volume is empty and one can look from the back into it with
some sort of illumination from within.
I will try in the next days how I can further the model.
Thank you so much
HEELonlyREDBoxSTEP_two.skp (2.6 MB)