For me personally, I went through all of LingoDeer (before they expanded with paid content, so I don’t know how much they changed) and didn’t retain one single thing. It was… fun? But useless for my overall grammar skill. Far too much multiple choice. Very, very simple multiple choice. I feel like you really have to sit down and take notes and create your own sentences if you want their method to yield long-lasting results. But maybe it works better for others. 
Edit:
At the time, I think I also wasn’t using their Anki-esque review feature that much. Maybe I would have gotten more out of it if I spent an extra hour a day using that? That’s certainly possible. I do remember liking those “story” lessons – some better reading and listening practice than the actual lessons offered.
I pesonally use BunPRO and the youtube channel KawaJapa CureDolly. I’ll spare people two long CureDolly posts two days in a row, so I’ll just link to this thread where I talk about my opinion.
If the audio-visual situation of the videos isn’t your thing, she also has a website with articles.
These two things together (plus being in the 30s of WK levels at the time) are the reason why I’m now replaying a VN in Japanese. It made a massive difference in my ability to read.