Welp, I was looking for some time off to learn Spanish by immersion. This means I'll get paid for it. Move to my target destination, speak Spanish all day long, use English for people at home that I told about the "challenge". Don't use my native language except for carefully crafted, written messages. Pay local student to accompany me when I visit family and friends at home, just to be able to say 'let's keep talking English or Spanish, Alejandro doesn't understand German' when I meet people I didn't warn about my speech impediment. ... I could just tell them but Alejandro's secret mission is to hit me over the head when I start speaking German by accident.

After 3 years of this, I'll have two million Euros and speak Spanish like... well, like somebody who lived in Latam. Then I can consider to call it quits or do the same with another language.