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Python 3.9 is supported by Sage 9.2, which comes indeed with some version of 3.8 (this is what is used when Sage can't find (or instructed to ignore) a suitable systemwide Python).

The upgrade to 3.9.1 was accepted 5 weeks ago (i. e. 9.3.betasomething), and an effort is underway to upgrade this to Python 9.2 (this ticket currently needs_review : you are welcome to contribute a test on your configuration...).

What leads you to the conclusion that the Python version is responsible for your difficulties ?