Alright, what would be thing that would change your mind?
Rigorous, Marxist research. Please do not take this as a request for you to show me anti-communist literature.
Why do you believe the opposite in the first place?
It depends what you mean by 'the opposite'. I think you have misunderstood what I'm saying. I'm not claiming that everybody liked the USSR. So 'the opposite' is not me accepting that some people disliked the USSR. I already know they didn't and I'm not denying it. I'm saying their view must be put into context, treated to analysis, and understood as a class-based perspective.
I know that many people did not like the USSR. I know that the proportion of people who did not like the USSR was different in different SSRs. I know that many people suffered in the USSR, some for good reasons and some who didn't deserve it. I know that the USSR made mistakes and that different SSRs made different mistakes. I know that the sum of errors made by the USSR led to it's dissolution.
More stories that people didn't like the USSR is not a new argument, it's more evidence for an existing, common argument, which I have heard many times and dismissed. You're making it sound like you think I've never read that anti-Soviet narrative. But every single part of my education was anti-communist.
I started with the anti-communist history, documentaries, survey data, movies, novels, etc, and I found it all lacking in basic requirements of logic and rigour. The anti-communist narrative does not hold up to any of the standards applied to any other idea or subject. This fact should raise alarm bells for anyone who claims to think critically.
More stories about people surviving and living normal lives in the USSR, even if they disliked the USSR, suggests the opposite of what you think it does. It suggests that not all dissidents were sent to Siberia it treated badly. More stories about this or that SSR that wanted to leave but 'couldn't', suggests the exact opposite of what you claim. If it's proof of anything, given that we know that the USSR ended and that e.g. the Baltics are no longer in the USSR, it proves that SSRs could leave.
I hold that the USSR was still a success because it's achievements are uncountable. Soviets turned the most backwards country in Europe into the world's second most powerful superpower in one generation, all without colonialism. Then they liberated the rest of Europe and Asia (supporting China, DPRK, Laos, and Vietnam) from brutal Nazis, fascists, and colonialists. Then they helped liberate much of Africa and parts of Latin America from the same brutal, murderous, terror regimes of western imperialists. There is nothing you could ever say to me that will make me think these were bad things. And I have only scratched the surface of foreign policy.
Nevermind near universal suffrage, education, housing, healthcare, employment, etc, at home. All at a time when the 'advanced civilisations' were raping and looting the world to strengthen the west, while their domestic populations didn't have anything close to universal education, housing, employment, healthcare, suffrage, etc. And did everything that people criticise the USSR for but on a much greater and more violent scale.
So the question is not what would change my mind, because I already have a nuanced and balanced view. The question is what would change your mind?
What would make you realise that implying that a Union of hundreds of million people, that defeated the Nazis, supported anti-colonial movements, and spanning 70 years, didn't do a single thing right? Because to me, insisting that 6 people and a survey taken at one particular time in one particular place as representative of the facts and experience of all those millions, across a wide geography and several decades is… it's not rigorous or logical, I'll say that much.