At home:

• Listen some of your favorite music on the speakers, and sing out loud with it;
• Listen a song that makes you feel "here" with headphones on, I don't know how to explain better than this, it's that song that makes you feel warm up inside. Close your eyes and pay attention to the notes, the instruments, try to focus 100% on the song;
• Open the notes app and write it down everything you are feeling, doesn't matter if it is ugly or repetitive, just write everything down;
• Pay attention to your surroundings, the smells, the colors. I like to touch something and feel the texture, while I try to remember memories with that texture, it can be anything: the wall of my bedroom, my skin, cloth, etc;
• When I feel unreal I like to hug something, a stuffed animal, a pillow or my cat, something that I can feel and makes me feel less lonely when I'm feeling very distanced from my body;
• If you are like me and have a problem with harming yourself, get rid of anything accessible to you that you can reach when feeling like that, make it difficult to get the object;
• Lay down on the floor and focus on everything you are feeling touching your skin, or focus on your breathing;
• If you feel very suicidal and you have a pet, try to stay around them till you feel better, usually when I feel that I may injure myself I bring my cat to my room and just lay on the floor or on the bed with him. Pets won't judge and seeing them will make you distracted and thinking twice when considering hurting yourself;
• When angry, tear down a piece of paper, or get a bunch of ice cubes and throw it on the bathroom stall;
• If you feel very numb watch a bunch of compilations of cute animals, or go to r/aww, may seem dumb but it makes me very distracted;
• I don't know why, but when I suddenly feel a very strong wave of anger I find something to clean, or to organize at home. It distracts me and I use all that angry energy to do something;
• Make lists, I try to list every movie I ever watched, or top 5 characters I like, etc. This one I like to do with friends too, but is very fun to do by yourself as well.

In public spaces or work, etc:

• Sometimes I go full numb mode, usually when it happens I keep staring at my hands, feeling unreal. When that happens and I'm at work or something, I carry around some hand moisturizer that I rub on my hands to feel something and it distracts me till I go back to normal;
• Drink a very cold cup of water;
• If you like coffee or tea, drink some, very slowly and focus on the smell and the taste;
• If you feel very angry suddenly, make a fist and press your fingers to your hand;
• Make a mental list of things around you, mind your surroundings;
• Sometimes I dissociate while I'm on a bus or just when I'm walking, when that happens I pay attention to the sounds around me and I try to list mentally them;
• Also, walking around is something that really helps me. When I'm struggling with my emotions, when I have a break at work I walk around to make my thoughts calm down a little bit.

Some other things:

• If you have self harm scars and is considering tattooing something to cover it, do it. I made one to cover up scars on my wrists and the tattooist won't judge you, or say anything. Remember: they cover up scars everyday, to them your skin is a canvas, doesn't matter how it looks.
• Do whatever helps you cope with your struggles, independent of how dumb you think people will think it is. Even if it is hugging a stuffed bear at your 20s, doesn't matter, you have the freedom to do whatever it helps you. You got this.
• You aren't alone on this.

If you guys have other little things that helps you, I would like to know as well!
(Sorry for any potentially spelling errors.)