Olá, @ilarchikov 
You’ve already received good tips from us via our support channel, which focused on continuing to build up your reading and listening comprehension through our advanced Shorties (as well as podcasts in general, newscasts, TV, etc), while also seeking opportunities to speak and write more, whether with a tutor, Portuguese-speaking friends or conversation exchange groups. For example, I highly recommend trying out one of the online practice groups hosted by our user Jana - all details here: New online conversation/practice group - #11 by enchantmentunlimited
You might notice that the more you learn, the harder/slower it is to continue to progress towards actual fluency, and the more customized your approach needs to be. Looking for content targeted to your personal areas of interest is a good way to boost motivation while still exposing yourself consistently to the language.