I'll skip past where we agree, and move to where we disagree.
You make a few small errors with your judgement that lead to massive misunderstandings of the mechanisms at play here, and thus the outcome of your analysis is flawed. Again, only a few errors, but the implications are massive.
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You see a correlation, and see fit to assume a causation, without digging into it further yourself. Case in point: You claiming that non-Capitalist countries tend to have worse outcomes than Capitalist countries, without looking any further.
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You claim that the US New Deal worked better for its people than the USSR did for Tsarist Russia or Maoist China did for the fascist KMT, which is similarly false, and it's absolutely critical that you listen very carefully to what I say without brushing me off, here. I am absolutely NOT denying that famine took the lives of millions of people directly as a consequence of mishandled and horribly botched collectivization. I am, however, pointing to the very real facts that post-collectivization and Socialization of the economy, Life expectancy doubled in both China and the USSR, and wealth inequality was cut massively. This is important.
I am adding on to point 2 here. In the US's case, a developed economy that was struggling massively expanded Social Safety Nets for great results. The floor itself, however, started much, much, much higher than the squalor that Tsarist Russia and KMT-dominated China had. The actual, comparative leap was far greater in the USSR and Maoist China because the floor was far, far lower, even if the New Deal US had a far higher quality of life. It's like starting the US at 100, and it jumping to 125, but starting Russia at 20 and jumping to 70, and China at 10 and jumping to 60. I cannot understate how much of a dramatic improvement both countries had to their metrics.
This entire time, I know you've probably been shocked that I have been pointing this out, so I want to take the time to make this entirely clear: I DO NOT WANT A RECREATION OF THE USSR OR MAOIST CHINA, AND MILLIONS PERISHED DIRECTLY BECAUSE OF THE ACTIONS OF STALIN AND MAO, THAT WERE ENTIRELY AVOIDABLE AND TRAGIC. However, let's take a look at food security over the long term. In both Maoist China and the USSR, food stability rose steadily alongside industrialization until it became a non-issue. The starvation period for the USSR, for example, was during collectivization, and during WWII, when the Nazis invaded Ukraine. For Maoist China, it was early on, and happened because a massive overpopulation of rice-eating pests ate all of the rice, because Mao thought that the birds that ate both rice and the pests were the problem, and ordered his men to kill the birds. None of these problems are a necessary factor for collectivization, and can be entirely avoided by anyone halfway competent.
If you're still following along, I'll simplify. If you suspect that an outcome may be due to a certain cause, you must actually analyze the causes and see if they are necessarily repeatable if tried again, or if they can be implemented in a far better manner. Everything about Socialism that has failed seems to be entirely due to mismanagement and a lack of development, which any country should be able to learn from and avoid in their transition to Socialism.
Following that, I think getting a sound idea of theory would be fantastic for you personally. You don't have to agree with everything, or even with me, but I think it would help you greatly.
For pure leftist theory, I'll point you to Wage Labor and Capital and Value, Price, and Profit by Karl Marx, found here: https://www.marxists.org/
I'll also point you to reading An Anarchists FAQ found here: https://theanarchistlibrary.org/special/index
I personally find myself agreeing more with Anarchists on certain issues, and don't consider myself a Marxist-Leninist, for what it's worth, though I try to be as unbiased as possible when reading theory I am not familiar with.
Additionally, The Wretched of the Earth is a fantastic book on colonialism and Capitalism, as well as Blackshirts and Reds: Rational Fascism and the Fall of Communism in the USSR, which is a fantastic book on misconceptions about the USSR, why it fell, and the dangers of fascism and how it rises.