1. Check what apps you have, and filter out the ones that you need.
2. Go to your phone settings once in a while to just check and learn which apps have access to what permissions. If something looks unnecessary, you can turn it off or uninstall.
3. I have found that a lot of apps that I used sometimes had a default setting for running in the background irrespective of whether I used it or not. So, you can change these settings and turn it off for apps that you don't require to keep running. This definitely saves on your battery, especially if your phone is a couple of years old.
4. I am a person who likes only the most necessary, basic notifications on my phone. So, most of the apps have the notifications turned off, so I can see them only when I go into the app. If you get distracted constantly by the notification of any particular app, maybe going through the list of apps in your settings can push you to turn it off!
5. Clean caches, unwanted/spam messages- not everyday, but at least once in a while, maybe?
6. Use google photos, and backup all your device photos. I have found some people having ten thousand or more all on just their phones. I think apart from taking up all that space, your phone crashing can leave you with losing all of it! Just turn on auto backup! Google photos app also has a cool "free up space" option that can delete the photos on your device after safely backing it up on cloud.
How you have your phone is definitely your choice, but these can help you be better ready in case your phone crashes, or you have important data on your phone. So, this is more from the perspective of the safety of you and your data!
Why don't you pick up your phone and look through it? Weed out those unnecessary apps!