I have this one since three years ago, and it was lovely until lately, as you can see in the image, its leaves started to get tend to the ground, I used to water it once a week, so I tried to water it twice instead, but it didn't get better, it's leaves started to get yellow, I tried to water it less, like once every 10 days or more, but that didn't work too, because its leaves started to get brown, what should I do?

P.s. I live in a hot spot, and this summer most of my plants died, I don't know if the hot weather effect on them, but I didn't have any problems with them last summer!