As I've never heard you speaking in Spanish either in person or through a recording, I can't say whether I think you may be holding /l/ in the sequence /lt/ longer than a native speaker typically would. However, if you generally try to pronounce the article as a fully distinct word even in casual speech, it's possible that you may be speaking more carefully in casual contexts than native speakers might typically speak.
I would suggest trying to get feedback from a native speaker who is willing to tell you which sounds seem a little "foreign" to them when you say something. I wouldn't draw their attention to specific sounds, just ask them whether any sounds in a word, phrase o sentence that you say sound "foreign" to them, and which sounds they are. If they tell you about some sounds, but don't tell you about the sequence /lt/, then I would pay more attention to the sounds that they mention and not worry about pronouncing /lt/ for the time being.
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