It's not a matter of "giving up" something for Lent....it's a matter of changing ourselves for the better. Trying to be the person we ought to be the other days of the year....and hopefully, our seemingly temporary transformation for Lent....will become a good habit and will continue for the rest of our lives.
Therefore, in addition to the dietary restrictions, we try to better ourselves.
We are in our preparatory period before Great Lent....and we are given these weeks in order to prepare for Lent (which prepares us for Pascha). During these weeks we are to do some soul searching....and be honest with ourselves.
We need to find where we are lacking....perhaps we don't show others enough patience, perhaps we are easily offended, perhaps we are lazy, sarcastic, joke and tease others....thinking it's funny, and not caring that we are hurting others....because it's fun for us...and we are all that matters. ...in addition to giving up any addictions - overeating, drinking too much, smoking, gaming, watching TV too much, etc.
In this period of time we realize our own inequities...and then during Great Lent we work on them....trying not to hurt others, to be more helpful, selfless, patient, etc. Once we do this for the 40+ days of Great Lent and Holy Week.....it may very well become a habit, and after Pascha we will simply continue to be a better version of ourselves than we were before Great Lent.