The new ATH has happened already, it was a month before the having, remember? But if you mean the proper ATH, like 3 times higher than the previous one, than yes, I agree with you, it should happen a few months after halving, and that's what we are waiting for, because it was happening like that in previous years. In the meantime, don't panic when the price is suddenly down. Fluctuation is a normal thing for Bitcoin.