I suspect the answer changes depending on your level. If you are just starting, then total immersion probably just leaves you hungry & frustrated. When you have some vocab & need to learn all those little things about which verbs go with which nouns, drive a car, ride a horse, take a cab, & how to use all those ugly phrasal verbs naturally, then living in it is a great motivation, I suspect.

Being immersed in the language is ultimately the best way to learn it, because you're forced to be around and use the vocab plus other things you've learned on a regular basis in regular situations. ^^

Practicing a language, especially learning a foreign language for the first time, is the most difficult. Practicing dialogue with a native speaker, as often as possible (daily), is the best way. You can write, read, and speak it. Listening is important too - maybe watch some shows on Youtube in the language you are learning. I am happy to practice English communication with you, anytime. English is a difficult language to master, but you will master it soon. ^_^ ciao