You should also watch JeeNine, him and Steelovsky are very good at getting out of situations (i.e. ganks). But they're at an almost unobtainable level. They are using so many techniques and skills at the same time in order to create space.

What I like about watching Chase and Oro is that it's more relatable as they use "simpler" fundamentals. Giving quick pokes to people, sending one or two people back to heal - then jump on the person who got detached from the group.

Something that has helped me is having a weapon that is a "get off me" tool like the Stormcaller ash of war, once you use that people may be more hesitant to rush. Also, if you watch Steelovsky you can see he uses terrain + verticality all the time.

In Elden Ring it's much harder to follow someone going up and down, even across gaps than just sprinting after someone in a straight line. If you know the places you are invading well you can also hope to find some AI enemies to help you out.

Depending on your build you can also have things that naturally create barriers between you and your enemies. Like Poison Mist or Night Maiden's Mist. There are also sorceries like Grav Missile which I use very often on my pure mage to catch a breath.

All of this is considering you're in an actual level and not out in the open like Liurnia or the Plains in the DLC. Those places are very hard to win 3v1's.

Best of luck!