Thanks my friend.
I just enjoy the process of learning a new language, even if the next languages after Spanish are not very useful for me. It's like a hobby and I actually enjoy the hour I spend on Duolingo or learning Portuguese pronunciations.
A 10/10 I'd say is being able to understand everything going on movies, being in large groups in a bar and knowing everything that was going on, and being able to express yourself without pauses or needing to search for words, even if your vocab isn't as expansive as your native language. The literary levels would be an 11/10 imo
With Spanish, I'd say maybe in 10-15 of living in Mexico and speaking with my girlfriend, possibly I could approach the same level as in English. But I've reached a level where I'm ok with my ability to speak and understand so probably won't put any more formal study into my Spanish, just passively expanding through everyday life, and occasionally looking up words or searching for a grammar article for help.
The interesting thing is that language mastery is very fluid and you can sometimes backtrack in languages. I'd say my peak in French was a bit higher than my current Spanish level, but has since dropped since I've almost not spoken it in 3 years.
So I'd say currently:
English 10/10
Spanish 7/10
French 5/10 (peak was 7.5/10)
Portuguese 1/10
I don't think it'd take too much work to get French back to a 7/10, and hoping to have Portuguese up to like a 4 or 5/10 by the time I leave Brazil in March 2021.
Eventually I'd like to tackle Italian, since it seems like the romance languages become quite easy once you have a couple under your belt. After that, maybe German, but I couldn't see going beyond 6 b/c it would just be too difficult to learn something like Japanese or Russian w/almost 0 commonality w/my current languages. That would feel more like work than fun.