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Please know that these apps won't make you fluent but they will help you on your way to fluency. Use them, benefit from them but do not depend on them! Do not forget that fluency is not an easy goal to hit and one course/app alone is not going to teach you the whole language. Here are my favorite language learning apps but you should try them all yourself and find the one which works for you the best.
PS: Some of these are my affiliate links, which means I may get a commission for
recommending the product to you.

Lingq is my favorite language learning platform. I saw the most progress in my target language when I used it.

italki is an online language learning platform which connects language learners and teachers through video chat. You can get 10$ italki credits after your first purchase by using my link:

Reverso has dictionaries, online bilingual concordances, spell checking, and conjugation tools. You can use it on Youtube too!