There wasn't any single trend overall. Some went up, some went down, some were about the same, and some did more than one thing.
In the "up" category,
@Apple_Robert is the leading example. See the Fun With Graphs tri-weekly graph for the date when his rate increased. It varied some (i.e. the line wiggles a bit), but there's a notable change in slope in early 2020. You can look in Table 1 of past "Extrapolated" threads (always the 1st post) and see the actual numbers of who's up or down in the Delta Rate for that 6-month period. The links to prior threads are at the bottom of the 1st post here (and in each earlier 1st post).
In the "same" category, you're a good example. If you look at the same tri-weekly graph above, your line is pretty steady, even though Table 1 says your Delta Rate dropped by about a fifth. The tri-weekly graph covers about a year and a half, and I don't see a huge change in its slope from the latest 6-months vs. the prior 6-months. There's a slight knee roughly at the gap in late Dec 2020, but nothing like the knee of Apple_Robert in early 2020.
In the "down" category, or really the "up then down" category,
@C DM is interesting. They had a pretty low rate in the 1st half of 2020, then a jump in the 2nd half, then back to a low rate in the 1st half of 2021. The 1st graph of post #5 shows this, or take a look at the Delta Rate drop in Table 1. The Table 1 numbers show a jump to over 15 posts/day in the 2nd half of 2020, to under 1 post/day in the 1st half of 2021.
In general, you can scroll through each period's Table 1 and look at the Delta Rate numbers. A positive number is an increase in post rate, negative is decrease. The magnitude is important, relative to the basic rate, because one person's 5 posts/day could be 500%, while another's could be 15%.
Also recall that some people posted mostly in uncounted forums (list in post #1 above), so they could have hundreds of posts on the site, but those posts don't count in their post totals.
