The OnePlus 9rt May charge slowly because there is a problem with the charger or data cable.
The simplest reason why phones charge more slowly than they used to may have nothing to do with the phone itself. Instead, you may have a bad power cord or adapter, or a weak power supply. In the same case, Zifang also recommends the use of the original priority charger, and in most cases wireless charging will be slower.
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USB cables often appear, especially in homes with multiple users and devices. These cables often fall, bend, stay in positions where the temperature varies greatly, and even step on them. So before anything else, replace the cable and see if you can fix the problem.