There is one important trait of the human race that distinguishes itself from other species: We can keep working on a task in a consistent way for a very long time.
That’s how the highest skyscraper in your city gets build. That’s how your favorite author finishes his/her fiction series.
The same goes for language learning. A Second language can not be mastered in a short time. It is a marathon, not a sprint. consistency is the key.
The only reliable method for anyone to work on learning languages consistently over years is to build a daily learning routine. You cann’t call yourself committed if you rely on the spur of the moment.
In a way reaching fluency in a second language is just like building a skyscrapper, before you have a plan and put in the effort, they remain being out of reach for mortals.
Yet we build skyscrappers.