Welcome back @klye !
When you said: "My very soul aches and I don't know how to heal it." - you remind me of times when my soul was in pain, my heart was bleeding and almost anything could help or change it, no matter how hard I wanted it or tried to run away from it or even tried to run away from myself just to get rid of that drowning and suffocated feeling.
At the time I hated the most the expression heard from many, that somewhat wanted to help: "Time heals everything!" But it turns out it really does. Maybe not just the time but certainly time plays its role too.

On the other hand in such stage (at least it was for me like that) you don't have time even less strength to wait for that "time" to come cause you feel your whole been (heart, soul, and even body) would die before "the time" arrives.
As well at that stage, consciously or unconsciously we are torturing ourselves with all sorts of "whys" - Why me? Why to me? Why now? Why...? - and all sorts of "whats" - What did I do wrong? Wha should I do? What could I do? What...?

And most devastating is that all those questions don't have the answer or at least we don't know them, don't see them and can't reach them at that stage.
Good news is, all those questions, in fact, have the answer. The bad news is, those answers could only be seen from some distant point in the future. But, there is another good news. - It always turns out it was for some greater good! And if I may speak French - Such sheet happen to us to help us avoid much bigger (Himalayan size) sheet! - no matter how hard for each of us is to believe such "crap" might be true.

Because of all of that, a first thought that crosses my mind reading yours: "I'm unsure of the steps to take towards happiness." - was - Don't! - Don't try to walk toward happiness. Don't try to bring it back. It doesn't work that way! It's only useless waste of energy that would just pull you deeper down.

Forget yourself! Don't bother yourself with yourself. Turn your head on the other side. - Why? - If nothing else, because you are still YOU - no matter how you feel.
You are still the same nice, good, funny, playful, kind... person. You maybe lost something, but you didn't lose you neither your personality!
So, it turns out you are still rich, very rich in fact! As such, it means you have a lot to give! Remember that!!!

Therefore, go out (wherever it is) and bring happiness to others (from closest to most far ones) the way only you and nobody else can do it!
I promise you, you wouldn't need to take a single step toward happiness; you wouldn't need to make a slightest effort to bring it back. - It would come back to you by itself, - in the ways, shapes, forms, on the places and through the people you wold never imagine it could be possible!

Guaranteed! - And you would know it's true when you try it! 😊