One thing to keep in mind, just to get your expectations right. Kids are more neuroplastic than us, and it takes kids about 5 years of practicing every day to get fluent at their first language. They are learning a few more things for the first time during that too. But you can expect it to take about as many practice hours. So if you only practice 1 hour a week, it's gonna be a long time. But also, you don't need to hit the bar of "fluent" to solve your problem. Where kids are at after 1 year is very serviceable for it instead being a second language. If you plan to move to an english speaking country, that would be plenty to get by in your day to day life while you all of a sudden start also spending every day practicing.

Learning to read and interpret a new language is more than 10 times easier than learning to speak it. Even just writing in it, where you have all the time in the world to compose each sentence is going to take alot of practice to get good at. For speaking, you have to be quick enough to form full sentences in seconds, at a time where it's not the main thought process going on in your head.