Whatever you pick to learn, the most important thing is using it with people in your daily life. If you know a lot of Spanish speakers or live in a town with a lot of Hispanic immigrants, you'll learn Spanish much more quickly by using it with people daily and you'll keep what you learned for longer. Doesn't matter if you fuck up grammar or vocabulary, in fact most likely the single greatest block you'll find is just getting over the fear and shame of making mistakes. You already learned at least 1 language and one of the reasons you did so well despite being like 2 or 5 years old is because you weren't ashamed to make silly mistakes.
Whatever you pick to learn, the most important thing is using it with people in your daily life. If you know a lot of Spanish speakers or live in a town with a lot of Hispanic immigrants, you'll learn Spanish much more quickly by using it with people daily and you'll keep what you learned for longer. Doesn't matter if you fuck up grammar or vocabulary, in fact most likely the single greatest block you'll find is just getting over the fear and shame of making mistakes. You already learned at least 1 language and one of the reasons you did so well despite being like 2 or 5 years old is because you weren't ashamed to make silly mistakes.