Ads Revenue Sharing: Going up, with impressions going down?

I just checked the most recent payment - highest since I signed up last summer, yet my impressions have dropped considerably - a good 25% down over the last 2 months. Presumably due to people leaving Twitter and random algorithm changes.

It's hard to keep up. I currently put it down to 1 of 2 things:

1. More people are signing up to Premium and therefore more to share out
2. More people are signing up as advertisers.

Anybody else experiencing the same thing?

Q2 started, advertisers tend to pour in more money from end of March onwards.

This could also have an effect perhaps: