Question

به نظر سر حال نیستی بهتره یکم استراحت کنی

Answer 1

It seems you're under the weather. (I think) You'd better rest for a while.

Answer 2

You don't look fine / fresh. You'd better have some rest.

Answer 3

It seems you're not perked up , you'd better rest/relax/take a break a little ( you need a little rested)