What apps/technology were the most effective in acquiring a new foreign language?

I have been using Duolingo for almost 3 years to learn a language, but I don't know anything at all. 🙈

Of course, I have some basic vocabulary from the vocabulary words, but it's not conversational level. I'm currently considering buying textbooks and workbooks.

I think my biggest problems are that:

– I spend relatively little time learning
– I do not know how to create a study plan (where and how to start)

– I'm too much on the internet or with technology, learning something online is different from learning something offline (writing by hand or not being exposed to a screen also makes a difference in learning)

– I don't actively use the language I've learned, and I don't have contact with someone more experienced

How do you approach language learning? Which apps, technologies and techniques have helped you?