So to start, your soul is a totem of undying. To get your soul, you must use /trigger Soul to rip it out of your body. Now, this does come with a major drawback. You'll be capped at 6 hearts without your soul. But just put it back in using /trigger Soul to get back to normal.

Now you may be questioning. "Why should I rip my soul out?" Well, I'm glad you asked. You see, in "soulless" mode, you deal more damage than a regular player. (Attack damage is at 5.) Plus you also get a totem. Falling from the sky after a shulker decided to shoot you into the sky? Quickly rip your soul out to survive the fall! Dying in lava? Your soul will grant you fire resistance.

There is one slight problem though. Once you lose your soul. You don't have one to put back in your body. Well, all you need to do is find a replacement! Just kill an evoker, get the totem. And put that thing in ya! It'll fit good as new!