Since /t/ is a plosive phoneme you want to spend the least amount of time on it if you say the word “street”. Your goal is to get to the “ee” is of Street. Picture a clock in your head. If you sound out the word “street” you get “str” “ee” “t”. For each sound, hold for 1 sec. once ur fluent in that, half a second. Then slowly speed to a normal conversational rate of speech. (Learned this in therapy)