Every time you vent about parenting someone bursts in like the Kool-Aid man with "Have you tried..."
No.
Just stop.
So if you are on the struggle bus, let me bust in:
NO amount of gentle parenting, advice, regulation, meditation mindfulness, psychology, or any kind of mojo will make you a "good enough" parent to prevent your toddler completely losing the entirety of their shit about getting the wrong color cup.
Not your fault. There. Not. Your. Fault.