What else have you looked into and tried?
There’s quite a number of posts around discussing this issue, see the thread here for some clues. You may also want to try the Anaconda distribution and use Jupyter offerings in the Anaconda Navigator, and start using environments within Anaconda/conda. That way may keep you more insulated from issues caused if you install something that causes versions to shift in your environment and that way it doesn’t affect your entire system and cause issue like this.
Also, please don’t cross-post at multiple sites without linking to each and every similar post at each and every site. You potentially waste the time of multiple volunteer’s trying to help you. Also if a good answer is put in a reply at one site, others with the same issue later may not know the solution was provided elsewhere. At least if they are linked, the others later can check the related discussions. Keep in mind that the person you may end up helping find the answer could be a future version of yourself when you encounter the same problem perhaps a few months from now.