Mainly HN and ML subreddit, and a bunch of newsletters. My overarching goal is to completely stay away from Twitter (which I have stopped going to 2 months ago). I instead rely on the above to bubble up interesting things.
Also as others said, find something to build and work on and don’t keep looking sideways (aka Twitter, random news), just keep going. It can be discouraging and depressing to see that someone else is doing something similar. Instead go deep into what you’re doing and only once in a while check around.
Follow your own “train of thought”.
If you think back at the great advances in science or computing, deep work was done by people relentless pursuing their ideas — not bombarded constantly by “news”.
In the LLM era the barrier to build useful/interesting things has gotten very low, leading to a ton of distracting noise.