Questions about rating system?

So I’ve come back to Etterna after a while of not playing and when i first started playing charts, my rank would go up a little, as usual. But after a few days, I don’t seem to go up in rank at all anymore and it seems that I’m going down a little bit even though I’m playing charts at my skill level. I know I’ve asked a question similar to this about 2 years ago but like I said I haven’t been on etterna in a good couple of months and am wondering if the ranking system got revamped or something like that.

your rating will go up if you set better scores