poor signal?

I used to get excellent reception in my house. Over a month now I've had no service or 1 or 2 bars?I've also went into the store in carlsbad, nm, and I was told it had to do with the towers upgrading to 4G lte, but they don't know when everything will be working properly again?

Is anyone else having similar issues ?

Any tips to improve signal strength or solve the problem?