I have no interest in maintaining EPEL packages, so you will have to do it yourself, or find an EPEL maintainer to do it.

Still have lots of missing deps:

DEBUG util.py:596:  No matching package to install: 'gdal-python3 >= 1.10.0'
DEBUG util.py:596:  No matching package to install: 'natural-earth-map-data-110m'
DEBUG util.py:596:  No matching package to install: 'natural-earth-map-data-50m'
DEBUG util.py:596:  No matching package to install: 'python3-OWSLib >= 0.8.11'
DEBUG util.py:596:  No matching package to install: 'python3-pykdtree >= 1.2.2'
DEBUG util.py:596:  No matching package to install: 'python3-pyshp >= 1.1.4'
DEBUG util.py:596:  No matching package to install: 'python3-shapely >= 1.5.6'

This bug appears to have been reported against 'rawhide' during the Fedora 32 development cycle.
Changing version to 32.

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Maybe better luck in getting a build for EPEL9, if there is anyone out there willing to maintain? 
I'm not using it myself, only requesting on behalf of others.

A quick dependency check for EPEL9:

> $ git status
> On branch rawhide
> […]
> $ fedpkg --release epel9 mockbuild
> […]
> No matching package to install: 'natural-earth-map-data-110m'
> No matching package to install: 'natural-earth-map-data-50m'

Ok, I tried manually rebuilding natural-earth-map-data for EPEL9 locally using the rawhide branch. This package has no open EPEL9 request, but is also maintained by Elliott Sales de Andrade, so (per https://bugzilla.redhat.com/show_bug.cgi?id=1788804#c1) it would need to be picked up in EPEL by the packager that volunteers to work on cartopy in EPEL9.

> $ $ mock -r epel-9-x86_64 --clean && mock -r epel-9-x86_64 -i ~/fedora/other/natural-earth-map-data/results_natural-earth-map-data/5.1.2/2.el9/natural-earth-map-data-{50,110}m-5.1.2-2.el9.noarch.rpm && fedpkg --release epel9 mockbuild --no-clean
> […]
> No matching package to install: 'python3dist(matplotlib) >= 3.1'
> No matching package to install: 'python3dist(owslib) >= 0.18'
> […]
> No matching package to install: 'python3dist(pyproj) >= 3'
> No matching package to install: 'python3dist(pytest-mpl) >= 0.11'

That gives an idea of what will need to be branched and built in EPEL9 for this to be possible. Both matplotlib and pyproj have some nontrivial dependencies of their own.

“default” dependencies:

- matplotlib is bug 2041315
- pyproj is bug 2099676

“ows” extra dependencies:

- owslib is my package; it has no open EPEL9 request. It was blocked on pyproj in EPEL9, but that was very recently removed as a core dependency upstream. It looks like it is still missing python3dist(ipykernel), python3dist(nbconvert), and python3dist(nbsphinx), but that can be worked around by dropping the Sphinx-generated PDF documentation, so I will go ahead and branch it for EPEL9.

“tests” dependencies:

- pytest-mpl has no open EPEL9 request, but is also maintained by Elliott Sales de Andrade, so (per https://bugzilla.redhat.com/show_bug.cgi?id=1788804#c1) it would need to be picked up in EPEL by the packager that volunteers to work on cartopy in EPEL9; it presumably requires matplotlib