Mindfulness meditation is a big help here. It works for me but there are other methods, e.g. memento mori, psychedelics, journaling, minimalism, travel, nootropics, exercise until exhaustion, new social groups, always pushing a bit out of your comfort zone. It's a bit chicken and egg, but letting that seed be planted in your head and keep at it for a while and don't get caught up in dogma or any particular method.