I don't know if I have ADHD, but I struggle with this as well! Sometimes I'll write a message/email and there's a paren after every other sentence.
Lately I've been making an effort to substitute with a semicolon or bridge the thoughts with a dash:
"I'm thinking this - but I also think this."
Unsure if that's a correct usage of punctuation, but I feel like it helps the sentence feel more focused and an expansion of the thought, rather than a random segue (especially with work)
Edit: realized that I had broken my own rule seconds after posting
Reminds me how in outer wilds, the alien species writes in spirals, and replies or additional thoughts are added as branches to the spiral. It was actually inspired by the way the lead writer took notes.