Let me explain very easily how individualism is reconciled with...

In ancient pre-historical societies, the individual's achievement was actually directly beneficial to the commons. You go out on great hunt, you kill the mammoth, you bring it back-- the tribe feasts for months-- everyone celebrates your heroism, as you have fed them for months, all incentives are aligned.
Now-- in our age-- you go out, you make $12 billion dollars, wow, incredible-- & it's only incredible for you. It benefits nobody else. You are alone in your success. You have no commons, so you have to fly a helicopter somewhere & make it rain, you drop let's say $120 million dollars, not much for you now, on your NGO-- the people sing your praises, but they're not really your people. There is no real meaning to this-- the meaning it has is the opposite it had when you hunted the mammoth.
This is what Communism aims to solve-- it does not, in some Ayn Rand fever dream, seek to diminish the individual or refuse to recognize the heroism of individuals-- it rather seeks to align these things such that the celebration of individual achievement is *communally meaningful* in a material, and therefore, objective & undeniable manner.
Leviticus 19:10
"And thou shalt not glean thy vineyard, neither shalt thou gather every grape of thy vineyard; thou shalt leave them for the poor and stranger: I am the Lord your God."
You were commanded herein by God to not "take all of your increase"-- there must always be left the ability for those to glean what they can from the general banquet. The idea of even "owning all your grapes in your vineyard" was anathema.