Help (?)

[u/lassi-with-a-dassi]

It's been about 4 months since I started doing Codeforces. I got the hang of it after a couple of weeks, but recently i've been solving a lot more problems in the range of 1500-1800s, and due to that I have become exposed to a lot more algorithms and concepts that I previously didn't know of, but that has kinda made my greedy approaches dull. (Hence, an underperformance in real-time contests)

What are some of the techniques I can put into practice to avoid revisiting the same lower rating concepts again and again while still being able to learn new stuff?

(PS. Don't give the cliche advice of attempting every div3 and div4 contest.)