Any advice on how to move on faster?

My ex of 4 years left me 2 months ago and while I understand that's not a ton of time I really just would appreciate any advice on ways I can speed up this process and get over her faster.

The relationship had been on a sharp decline in the last year of it and as an anxious attachment and severe codependent I essentially threw all of my self worth onto this girl who wasn't able to reciprocate the love I showed her. She left me abruptly soon after we took a big country wide trip and just days after we went to a large theme park to celebrate our 4th anniversary and these last two months have been hell.

I've tried acceptance, I went and have been no contact for about a month, I've tried to rebound, even had cheap and unsatisfying sex with multiple of my other exes who all reached out to me when they found out I was single again and I said yes to these other exes after i had found out that my most recent ex of 4 years had been fucking a new guy just over a week after leaving me.

but nothing from meditation to trying to fill the void has helped me. Am I really just fucked and have to continue feeling this pain for who knows how long? And will this ever really go away? Because I feel like I lost my best friend and the girl I really thought I could spend a lifetime with. Any advice on how to speed this up would be appreciated because I'm just tired of missing someone who obviously doesn't feel the same about me.