I think that most systems are flawed and, given enough time, will be corrupted and ruined.

That has happened with (to my knowledge) every communist nation out there, from USSR to Cuba.

Similarly, that has already happened with the capitalist US: corporate interests over those of people, and the interests of the rich over everyone else; at times, it's something like the plot right out of a Deus Ex game: https://youtu.be/_fHfgU8oMSo .

Honestly, the same is also probably happening with the more socialist leaning EU, at least based on how many stories about corruption and bribes one hears on the news in my country, not even thinking about the same on a grander scale.

I don't really have any solutions to offer or ideologies to push and i'm not sure whether individuals being politically active is (always) even that effective, just look at Russia and how many people there are in prisons, or how polarized everything is in US with identity politics.

All i can say for sure is that humans and human nature are the common denominator in every single one of those systems, in which the reality eventually differs from the theory behind them.