Watch the Practice Tips online guitar lesson by Richard Gilewitz from Guitar Foundations
There are so many practicing tips I could consider offering at this point but the most important one or two I can think of have to do with doing whatever it takes to make playing the guitar a part of your life. Although sometimes sacrifices must be made, sometimes just at a minimum, such as getting up 15 minutes earlier or going to bed 15 minutes later, get in a bit each day if possible.
Another might be to always work on a new piece. But don’t pressure yourself. Act as if, in a somewhat meditative state, you are simply putting a puzzle together and have as much time is needed to getting the job done.