Block devices in OpenWrt

I tried blocking the devices using mac addresses in firewall and it was successful but after the dhcp lease expired same devices came back with new mac addresses.
Whats the solution for this problem if devices have turned on random mac address?

Many devices use random MAC addresses, I think you need to search for a different solution: authentication, segregated networks, ...


can you please post a link for it?
Thank you,

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the problem is. I have pi4 as main router then tplink archer c7 v1 with default tplink firmware as wifi router.
How can i control and block the access of devices from main openwrt pi4?