I'm not sure how well this will translate to PS4, but some settings I find useful are to turn "Toggle Beam Connection" on, turn "Guardian Angel Prefers Beam Target" off, and turn "Toggle Guardian Angel" off. Toggle Beam Connection will allow you to simply click once to connect your beam so you can focus on other things rather than holding your button down. Small QOL thing but it helps. Guardian Angel Prefers Beam Target will allow you to fly to players that your beam isn't connected to and still heal them. I find this helps a lot with being a more mobile hero. Finally, Toggle Guardian Angel allows you to point your cursor in the direction of a character and while holding down Guardian Angel, immediately fly to them when they're available. This is nice for trying to heal snipers that only peek out very slightly and allows you to fly to them. As far as general tips go, your beam stays connected through walls for about 1.5 seconds and you can reset this by peeking around corners, helping you to heal from a safe place. Experiment with how far away you can be from a character and continue to heal them. Also, check for flankers while healing. It'll help you and your team know where the enemies are and you won't need to stop healing.