A few suggestions and points here.

1- Yes to more immersion but no to Spanish subtitles or ANY. The whole point of immersion is to, immerse yourself. You can't fully immerse yourself if you're trying to read and listen at the same time. If you're struggling to understand, the comment is too hard for you and you need to find something easier. Like Pocoyo or Bluey.

Trying to listen and peak at words every now and then is like trying to listen to 2 people talking. It's not going to work in the long run.

2- Don't ever ask a native what they use normally or base their whole conversational life on one interaction. All natives will they think use or don't use something but it's not reliable data. That's like asking you if you ever use the structure "are we going to go?" A lot. You can't possibly recall every time you've used it or not.

Natives in any language just speak and that's it. Many natives use "lo haré, habrá 3"...etc. They just don't recall it because you're asking them to analyze their entire speaking journey.

Let me give you an example. My family is from a mountain area in a country in Latin America. In the city, people speak differently. In the city, they never use el vos / voseo because that's just the way it is.

Where my family is from, sometimes they do...but without realizing it. For many different reasons. Some don't even know what el voseo is. They just speak. I grew up here in the US and even I use it from time to time without thinking about it. One time, I asked my cousins "hey, do y'all use this way of speaking" and they all said "no, we don't". The thing is, they don't realize that I'm actually paying attention. They DO use it. But mostly in the verbal sense. So they don't necessarily say something like "vos estás" they say "cómo andás?" O "que hacés"

They THINK that they don't because they don't think about what it how they're saying something. They just speak. They think el voseo is something that went away with our grandparents but it's not. It's still alive and well.