I know you all are dealing with DDoS and how that goes. I run DDoS mitigation for some juicy targets and do a lot of on-call response to handle those issues, so believe me when I say I know what you are dealing with.
However, that being said, it appears you are blocking tor exit nodes with a 403, likely at your web termination point (nginx, apache, whatever), and this kind of sucks.
I get that tor can bring some attacks, and I fully support a modulated response to those attacks, preferably one with a reasonable time decay, but please don’t just block all of tor
Alternatively, be one of the cool kids, and setup an onion service for lemmy.world!
As an alternative, you can run your own instance of Lemmy and funnel all the non activitypub traffic via the clearweb and all your browsing via tor.
I doubt admins will unblock tor because the amount of shit that gets yeeted out vastly outweighs the few users who legitimately use it. I worked for an ISP for almost a decade and use tor for data validation but the amount of other crap coming from exit nodes is unbelievable.