Rating goes up and down a ton by natural fluctuations. Besides, rating gains aren't linear. Rating is tougher to gain the higher you get. I'm sure GMs like GM Magnus Carlsen have worked on chess more than all of us here, yet he has been "stuck" at 2800 rating range in OTB chess for literally a decade now. Conversely, I know lots of beginner chess players who have made amazing gains to reach new ratings a few hundred points higher after just a few weeks or months.
Clearly, there is more to rating than just a steady and upwards gain.
Based on your rate of progress, I'd predict that if you continue playing multiple games every day, you will break 1,000 in July, and that's accounting for a slowdown. I just looked closely at my chart and looks like I went from 550 to just under 1300 (+750) in 5 months, for context, playing an average of 8.5 rapid games a day. +250 in 6 weeks is something you might get at the very start, but keeping that up would be impossible unless you have all day every day to spend on chess. From now on my own goal is +100 a month for as long as I can manage it, then +50 a month.
thanks for the info!