I'll be the first to admit that it's not easy.
However, it is a million times easier when you know them personally, as opposed to anonymous conversations over the internet. That's where I really think the most progress is made.
First of all, you need to personalize liberals and be open with your politics. Liberals aren't some hidden monsters in the dark, they're friends and neighbors, folks these guys know are good people who aren't trying to groom children or any of the other bs these guys spout.
My response to something like that is "Hey I'm a Liberal. Are you really gonna murder me? We'd never talk or hang out ever again, is that what you really want?"
Even your personal friends who told you to 'stay out of it for the sake of your family' they understand that they don't want you to die over this. Be like, "wouldn't you be sad if my family was murdered by some lunatic?"
These people aren't completely devoid of empathy, they've been propagandized into thinking Liberals aren't human by warping your political beliefs. Once folks know you and know you're a liberal, you get asked to weigh in on things and if you can explain things in common sense terms, you can really reach people.
As a specific example, I am often asked about the war in Ukraine. Asked why aren't we spending this money at home, asked why we're getting involved in another war, asked why we started a war with Russia. And I just stick to the basics, I tell them listen we Americans do a lot wrong, but one thing we do right is we often help folks who are getting invaded or massacred. If you're invaded by a country 5x your size, Americans will come and put a gun in your hand and give you a fighting chance to defend yourself and your home. That makes people stop and think quite a bit. It's all about how you phrase what you believe in and why. When it comes to things like welfare, or the free school lunch program, I just ask them hey if you and your wife lost your job, wouldn't it help to know that Caleb and Audrey are still getting fed at school? And they start to get it. It's about appealing to their sense of patriotism, their sense of unity and once folks understand what kind of policies they ought to support, you can bring them away from Trump and his cult of cruelty. Work with individual policy first, then they understand their politicians don't support these policies.
The problem is often these folks are single issue voters, especially with regards to abortion and guns, and you gotta know the consequences of these policies enough to paint a picture of what that would entail for them and their family if they were in this situation. I've won over people by asking what they would do if their wife had a dead baby inside her that was slowly killing her. They always, if hesitantly, admit they'd want an abortion, and I'm like even in these situations abortion is being banned, and they start to get it.
Conservatives strangely are really good at getting it once you can get them to put themselves in the shoes of folks who have to deal with this stuff, then you just appeal to a basic sense of universal fairness. Shouldn't everybody be able to have their kids fed, shouldn't everybody be able to choose their medical decisions for their family?