I've found that it's easier to avoid misery than it is to find joy. Some tips given here reflect that as well. Cut off toxic people from your life. Don't dwell on tiny things for the full day.

I have an example. I went to get some coffee yesterday. There was a man in front of barista counter. The barista asked me for my order, and my instinct was to ask if the man next to me had been served. I didn't think twice about it. She got visibly upset at me for having the audacity to ask him. She took my order but she continued to mumble audibly about how she gave eye contact, and she knew how to do her job, etc. As if my remark towards the man belittled her experience and skills.

She had no idea what my intent was, but she assumed the worst. For doing so, she ruined her own day with it. It's all about perspective.

She also ruined my coffee but I didn't let that ruin my day either haha.