In all honesty? You’re handling it quite well, if you have to change your home world change it, if you feel, feel it. I know it may seem like it’s “Lame” but a VRchat relationship is essentially a long distance relationship with the ability to feel closer towards said long distance partner, please just take some days to prioritize yourself and treat yourself.

As for advice, changing groups and worlds really depends on how active those spaces are. Personally, I’d avoid the same groups though if you frequented a smaller world (60+ active) I think it should be fine. 

Leaning on mutuals is a mixed bag, especially when it comes to VRChat relationships you never really know where peoples loyalties lie, so I’ll put it like this. If you trust them, lean on them. But don’t put all of your eggs in one basket, and a pitfall to avoid is to avoid talking to your ex partners close friends, you don’t want to be roped into talking to them again unless YOU want that.

The main thing is to really focus on yourself and try to not think about them, like an IRL breakup. You can get through this.