2.4ghz and smart lights

Can anyone help me adjust the channel on the 2.4ghz band of the wifi? I have several (30) smart lights, 3 google minis and 2 alexas and the lights just work on the 2.4ghz band. I can't get them all to work when anyone connects anything else to my wifi. I tried changing the name of the 5ghz band and that doesn't work. Does anyone know if I need to buy another router that has more 2.4ghz band channels or what should I do? Please help!