You don’t mention if you are using node-red. If so, take a look at this post, Cannot connect node-red using node-red-contrib-blynk-iot on RPi - Blynk 2.0 - Blynk Community.
I had to upgrade Node.js. I just recently added (June 2021) a library in node-red that uses Python. I don’t recall if I update Python at that time nor do I know what version I’m running. I did not have to upgrade Python due to Blynk 2.0.
HTH.
Larry