Books

Step 1: learn English for 7 years from grade 5 to 12

Step 2: the Internet exists and is overrun with Americans.

Step 3: profit

Once you are at the level where you don't translate words, but instead the words are linked in your mind to the concept itself, consuming media is no longer a chore.

It will probably be harder to learn a language other than English, because so much content is available in English (I know three YouTubers from the top of my head that create english content despite not being native speakers and one fiction writer). Though I obviously can't properly judge this as I only speak German and English. I have no idea if there is a Spanish focused YouTube for example. Due to the great firewall Chinese will probably be easiest to learn in that regard.