How to set up router parental controls / limit access

Hey everyone, I’ve got a bit of a situation here and I'm wondering if there's a way to tweak my Wi-Fi router settings to strictly limit how many devices can jump on at once. Basically, I want to set a hard cap—say, a maximum of four people—so that once those slots are filled, nobody else gets online. Even if someone else knows the password, they should just be stuck waiting in line until one of the active users hops off. You get what I'm saying, right? I'm trying to manage access so I can limit it to exactly four devices, and anyone else trying to connect just has to wait their turn while someone else disconnects. 😁

Sure, just set the address range to 4 and you're good...