Leverage brain biases by having a good high point and ending the day well as that's most of what you'll remember. Foster a cool environment with fun activities. Customize happiness by defining what a happy day involves for you using past data. Increase the number of "high smile effect" things in your life: employment, intercourse, relationships, health, etc.
Eric BarkerPeople will reflect the energy you're sending them, show joy! If you close yourself to negative emotions, you'll likely miss out the positive emotions too. Reason isn't separated from emotions, emotions assign value to things that help you rationally calculate. It's easier for people to maintain surface-level connections, meaning most people never have the chance to tell their life story. When people are down, acknowledge their reality, show a burst of good will, keep in light touches constantly, admire their courage, remind you are here.
David BrooksYou can be healthy single but not alone. Friendship = Proximity x Frequency x Duration x Intensity. University is the utopian way to make deep friendships, after that differences appear and friend groups shrink with interests as well as growth. Find the 3 things you really like and try real-life groups for 10 or more times to build interest-based friendships, if you can deeper over time then the bond will suffice. You can't connect with co-workers when working remote nor job-hopping and your spouse may not have quality time with a person that you're having quality time with.
Mark Manson