If you're looking for a community, there is also an IRC channel named #algorithms on Libera where competitive programming discussions are on topic. The channel is not officially associated with the Codeforces community but there is some overlap, in the sense that some people who are active on Codeforces also spend time there. Visit <https://web.libera.chat/#algorithms> to join the channel via the web gateway.
Disclosure: I am one of the people who has been operating this channel since 2007, first on Freenode and later on Libera.