If all users are now getting decent connections (except for the drops), a mesh router system might be more than you need, although it would definitely be an improvement.

AX50 links:

https://www.tp-link.com/us/home-netw...r/archer-ax50/

https://www.amazon.com/TP-Link-WiFi-.../dp/B07YMFZ28Q

https://www.newegg.com/netgear-arche...82E16833704495