I'm a big fan of RoleplayingTips, which has been running for decades, now. There's a ton of useful information in there and he features different people all the time

If you are ok with including Substack newsletters, you can add /feed to the URL to get the rss. Here’s some I follow:

https://hearthside.substack.com/

https://bastionland.substack.com/

https://ttrpg.substack.com/

https://questingbeast.substack.com/

https://thaumavore.substack.com/

https://soloist.substack.com/