Closing RFDs
Most red links go point to pages that should exist. It's worth the effort to remove those that don't. As for a concerted effort, I'd support it, but it sounds challenging given all the kinds of entries that shouldn't exist (failed RFD/RFV should be findable, but most such links point to entries that were never created).
It is probably very hard to do in general for all languages, but it may be easier to do for something like Proto-Indo-European. I've noticed a lot of entries linking to PIE reconstructions that are obvious rubbish/outdated. It may also be easier to weed out incorrect links to English, given that our coverage of English is huge and not a lot of red links will be left. Though I may be wrong on that.
I appreciate you closing all those RFDs, but once again, you are forgetting to check whether there are links to the Latin reconstructions that ought to be dealt with, e.g. Special:WhatLinksHere/Reconstruction:Latin/circlus. Can you please deal with those, and check the other ones as well?