Wifi Extender or Strong 4G Router?

Salam Alaikum,

I have a Zong 4G MiFi device. It works fine on 1st floor but on 2nd floor, signals are very weak.

Should I buy Wifi extender or 4g router۔

Can anyone please guide me.? please also suggest a model number.

Thanks

TP Link Wifi Extender

Plug into any Power Socket and Its Going to Coverup whole House with no Dead Spots.

i go a wifi repeater from ali express it was Chinese but it did a job for me i got it for 1500 PKR , i dont know what TP link cost if its around same price go for it ...

Link of repeater i bought