You're not alone. On iStock so far this year (minus December, of course), I've had nearly 4,000 downloads with an average per download commission of between $3 and $4.
I don't see that trend changing in 2025. If anything, it will probably go down. Eventually, I probably won't produce stock much anymore--or at least, at the rate I normally produce. It's just not worth it.
Pond5, on the other hand, still had a more respectable ~$42 per download commission rate, but I get about 80% fewer downloads than iStock.