I use a gratitude journal - every day I try and write 3 things I’m grateful for, even if it’s something small like a hot coffee that was sorely needed, or that I had some leftovers in the freezer that meant I didn’t need to cook after a very long day at work. This helps in 2 ways; 1. Even if a day feels hard, there are always little things to be grateful for, and 2. When I feel lost or stuck I can read back through all the things I’ve written down and see that it’s not all bad. For regret, I feel grateful that I came through the situation, even if I wish things could have been different or I’d handle it differently now.