It is true that through Duolingo you will not learn to speak the language perfectly but there are other learning methods, we all speak a language, when we were children we knew how to speak it perfectly before we learned to read, we knew the meaning of many words. We did not take a language course to learn to speak it, what we did was listen.

you have had a great advance but I have a suggestion, "read stories in German" "read dialogues in German by themes" obviously with their translations into English

keep listening to German songs, watch movies, use the input / output method. "Listen, speak, write, see"

but the most important method of all this is to listen

I hope I have been of help, good luck with your German! regards