Just to chime in here with my thoughts. You will only get good at a skill that you practice. Lingvist essentially is a vocab teaching tool because it teaches you vocab, all you practice is vocab, and that's it.
You won't be able to speak a language unless you practice speaking it. Out loud. With people. Lingvist can't solve this without adding a video chat feature. In the meantime, look for people who want to do language exchange on Skype or go to italki and hire a tutor to work with you over video conference.
My routine currently with German is to do 150 cards with Lingvist every day. This is about thirty minutes of work. Since about mid-January I've gotten to about 75% on the "words you know" metric with that level of effort. I can read a lot more and write a long more now when I practice those skills. However, I can't speak more fluently because of Lingvist. For this I work with tutors on italki. I sit at my house on my laptop and Skype people. I can tell I'm getting more fluid and fluent, and with the vocab I get from Lingvist, I'm able to say more things. At first, I have to stop and try to recall a word, but as I use it more and more, it just comes out of my mouth when talking.
Anyway, what I'm saying is that you have to understand that what you do on Lingvist is what it will make you better at. That's vocab. There isn't some carryover where you learn vocab with Lingvist and suddenly can inflect verbs and compose complicated sentences with conjunctions. To get better in a skill, you must practice that skill. And "speaking a language" isn't one skill. It's many: reading, writing, listening, speaking. And inside there, there are sub-skills: verb inflections, noun inflections, adjective inflections, word order, vocabulary recall, etc.
Lingvist almost exclusively teaches vocabulary recall. You need other tools for other parts.