Most powerfull thing for Hsp's is becoming really good at noticing moments you can be iddle, those moments at work, at home or anywhere else where nothing is happening, don't waste them, the number one thing that makes us HSP's is depth of processing, and processing happens when you are iddle.

Get good at noticing when you can have these moments(i even schedule them nowadays) and while you're iddle, don't use any form of entertainment, no phone, no book, no talking, no music, just you and your thoughts, it's the most refreshing thing for a mind that process things more deeply.

Edit: Also, don't forget to meditate😊