4G/LTE mobile broadband is a very good alternative where fast landline/fibre broadband is not available.
You would need to check coverage in your area.
Providers are Orange, SFR, Bouyues and Free.
If the signal is weak but usable it may be possible (subject to survey) to add external aerials to the router to improve reliability and speed.
Call me on 06 04 17 72 05 to arrange a visit to see if your mobile broadband service can be improved