Lenin was the Russian revolutionary that overthrew the Tsar. Are you seriously trying to argue that Lenin, who explicitly condemned and even wrote a book condemning “left-communism”, is a fucking “leftcom”?

Leftcom : Enemy Unknown. You don't even know the positions of leftcom and you are asking me to explain why my positions are wrong. Lmfao

Once again, explain to me: How is not adapting your ideas to match material reality, instead endlessly and relentlessly attacking every and all socialist projects supposed to help the cause of the global proletarian revolution?

Most of the attacks on the communist position, disguised as "defending socialist countries" or "adapting to new conditions", were resolved by Marx and Engels themselves. For things like "Socialism in One country", "socialism as understood as govt ownership", the criticism of opportunism, the criticism of "AES", you can read Dialogue with Stalin. Link - https://libriincogniti.wordpress.com/2017/12/13/amadeo-bordiga-dialogue-with-stalin/

I will warn you, I fully expect you to ask me to summarize it rather than you actually putting in time to read something, so I will tell in advance that I will not do so.

holy shit lmao ok just sit on your couch forever then espousing your “pure” ideology ok ok man

Not a leftcom position to "do nothing". I am speaking in the context of the party, which I have already explained does a lot of things, like clarifying their positions, preserving the doctrine etc. And in the time of right historical conditions, it is the party that has the program and takes leadership.

In the context of individual proletarians, the most useful things you can do are to form associations with other workers, be open and loud about your views and aims, read the original Marxist doctrine, engage in class struggle at the workplace (which is always risky and dangerous, due to risk of losing livelihoods or even lives), and of course, also contribute to party work, as long as you have first fully assimilated the communist position.