Fully-remote I couldn't say (I feel it'd be much harder for client acquisition to build the same level of trust), but pre-pandemic, and shortly after its start I was able to consistently make ~800EUR/day (100EUR/hr) on gigs where I was in the office 1 day/week in Berlin. ~75% of clients accepted that rate on the spot, so with a lot of inbound requests, you could probably even push for more.

That was mostly for full-stack (Node)JS jobs.