How did you get over the last threshold to fluency in Spanish?

Yes I found Fijador Sellador but not sure if its actually a primer or sealant... Seems like it is a cheap way to paint walls before applying the expensive paint but not sure...
Yep, that's what they use for primer here. Something like tvis:

 
Any tips? I am perfectly fine making small talk with uber drivers, taxistas, waiters, etc... But what did you do to get to the point where you could speak with ease on a complex subject, like going into OSDE to deal with administrative stuff, speaking with co-workers in Spanish, etc...?
And what does one do when he has 14 thresholds?
 
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