I think the problem is that you have selectively paid attention to a few selected phonemes, and taken great effort to pronounce them in an American way--but you overdo it, to the point of comic exaggeration--while some others still do not sound right at all. You've moved far away from the typical Hispanic accent, but unfortunately you haven't moved closer to natural American speech--you've produced something very strange. Some individual phrases here and there sound perfect, just right. "I would say" at 0:46 is perfect. At 0:55 you've let your guard down on the "a" vowel, and the word "that" sounds like "dot." At 0:44 you aren't hitting the "n" in "learn" hard enough and it sounds like "lurr." I think I know what you're trying to do with "very" at 0:49 and the "o" in "Portuguese" at 0:30. The British think that U.S. speakers pronounce "very American" as "vurry Amurrican." But it's not as strong as all that. We don't really say "vurry" and we don't really say "Purtuguese" or "Pertuguese," you're overdoing it.

Please do not take this the wrong way, but your voice sounds like a computer. I did not notice any accent, more like an announcer on American TV. Your voice though sounds as if you are forcing it too much. Very gravely and was a little hard to understand. Your usage of words and sentences are great. I wish you luck and continue learning of English, German and Portuguese.