In Jan/Feb I've put in the most proposals I've ever put in in one month on Upwork and only this week did I get three offers (all on the same day). And quite a few interviews came to nothing (so far) as well because the clients haven't hired anyone - not on Upwork anyway.
But that's self-employment for you - valleys to peaks and back to valleys
Personally, I've found clients trying to negotiate a lower fee too but I'm not willing to go below my threshold. So maybe it's a "time-of-the-year thing".
I've noticed a significant lull over the last 2-3 months.
Same thing. Fewer replies to proposals, and fewer jobs from those that do reply. COVID can't be helping. It's also usually a bit quieter this time of year anyway.