Solving wi-fi not spots can be fun, i.e. what works for one person may not work for you in terms of routers.
The Mesh and WiFi disc options are the best path to solve things.
If you accept using a VDSL2 modem in bridge mode, then your choice of router is much wider. The TP-Link W9970 may be old but it is cheap (turn off wireless) but in bridge mode its stable and runs with G.INP and vectoring for VDSL2 and will happily feed the wide choice of routers with Ethernet WAN ports.
Had my W9970 for 4 years now and would replace with same if it died, and if buying a router something like ASUS RT-AX56U Wifi 6 AX1800 Dual-Band Mesh where WiFi speeds will far exceed VDSL2 speeds and can mesh with other Asus AIMesh routers if I needed to fill in coverage gaps in the wifi. Though as I know FTTP is on the way I might consider spending more on the main WiFi router to find something that should deliver 500 Mbps over WiFi easily