I didn't defederate anything tbh. I'm on masto.host so I'm guessing I either inherited some default block list from them or somehow I've floated through the Fedi-ether thus far unharassed 🤷♂️
As for content, I feel like I'm getting a pretty good feed. I was using the infosec.exchange relay for a bit which helped. I also have close to 2k followers and 1k following which helps move my stuff around and get stuff into my feed.