Orange operates the largest fibre footprint in France and significant FTTH coverage in Spain and Poland. Plans on Livebox 6 / 7 routers regularly deliver close to the advertised speed, especially on a wired connection.
Your Ethernet port is 1 GbE. Use the Livebox's multi-gig port (2.5 GbE on Livebox 6, 10 GbE on Livebox 7) and a CAT6 cable.
Expected, 6 GHz signal attenuates quickly through walls. Position the Livebox centrally and use Wi-Fi extenders for distant rooms.
Disable the 'compatibility' band and force 5 GHz Wi-Fi 6 only on modern devices.