We don’t have update to chip on our roadmap, right now we support only nRF52811 for high-volume low-cost deployments. The reason for not supporting higher end chips is that they are not electronically compatible with PCB, we’d need to do a redesign and all the laboratory testing involved.
Ruuvi Gateway which has a built-in low noise amplifier for Bluetooth signal which boosts reception quite a bit. Fruitymesh, Miramesh and Wirepas mesh networks run on RuuviTags if mesh is absolutely needed, but those are paid-for third party options and usually suitable only for business clients.
Which receiver are you using? I have a RuuviTag in my attic and I receive its signals on the ground floor, just with my laptop’s built-in BLE adapter, as well as with a Raspberry Pi 3B+. Using an external adapter could help.