Emotional processing. Just sit or lay down for a moment and let that stuff come. Go straight into all of it. Awkward and painful moments. Frustrations.. It'll feel so much better afterward!

Something to avoid would be letting others set your standard. You set your own standard.

Keep a journal. Every day just jot down how you're feeling and what's on your mind, what you plan to do/did. Its amazing how helpful this has been for me.

Don't drink alcohol. It's not good for you in any amount.

Reading books on daily basis. It's a qualitatively different experience from reading websites or consuming other form of media. If you have trouble getting into reading, I recommend picking a particular time and place, then reading at least a few pages every day. Eventually, it will turn into a habit and you'll be reading for longer periods. Another thing I recommend is finding books on topics you're interested in, be it fiction or non fiction, and don't feel bad about abandoning books if you find you're not enjoying it.

Set a timer for when you're sitting at a desk and working. Every hour, I get up and do something or go get some water. It helps

Practicing critical thinking.

Many here have already recommended reading and, particularly, reading philosophy. That's a great way to practice critical thinking and to practice thinking outside of our comfortable or familiar ways. I'd add not to skip reading about logical fallacies and cognitive biases.

Many good things come from being a little cautious with apparent knowledge. To keep a reasonable doubt is also to keep our curiosity going, to keep asking questions, to imagine different ways, to discover new things, to avoid stagnant beliefs, etc. Critical thinking makes us not only less gullible but also flexible. This is valuable to understand everything, including one another, and perhaps in doing so, giving us better relationships and better societies.