Bad idea to learn 3 languages at once?

So I am fairly proficient at Spanish (I’ve been told I sound native but I still struggle with listening — struggle with listening even in my native English lol). I’ve been studying french on my own a few months and it’s been going well. I also took a semester of Japanese and now study that on my own which I’ve found tougher (so I meet with a native to practice). I feel like life is too short and there are so many beautiful languages I feel a strong urge to start learning another one right now even though it’s not recommended.. not even two at once is. BUT if I’m self studying two languages and I start this third one (either Arabic or German..) with courses does that make a difference? Wouldn’t it be easier I mean? Since two are self structured and one is school structured, so more thorough and efficient in that sense?