I spent 6+ months using anki for SRS and I only realised a few weeks ago that I was literally not learning anything because it was boring to me. I found out my brain just doesnt work when something is boring to me. Instead I have been been building a database of all language and grammar and just by making this, which is something I enjoy doing because im a massive nerd, I realised how much more it stuck with me. Just wanna say if you're having trouble with anki or SRS, try to make it into something you enjoy rather than a chore you have to do everyday and its insane how much better you'll take in information.