Does he ask you why you don’t go back to the meetings? Tell him why you "feel" the meetings are not what they claim they are. Thought provoking questions would be a good way to get him to think.
When my younger sister stopped going to the meetings I told her that if she believes it is the truth she should go and not find excuses not to go. Then I told her why I don’t go, mentioning the hypocrisy and enmities among elder families she was full aware off. My main point was always the identifying mark of love. Where is that love?
It can take years for some, just like it took us time to come to realize things. Questions and living without guilt and fear worked best for me. Salvation only through the WT!? That was another topic to help with the guilt-force. Will Jehovah really kill you for not going to the meetings? Let your brother see that leaving the organization means not leaving God.
But you just doing fine and coping with life is the best "witness". Maybe let him meet the new friends you have made among the ‘worldly people’. Because you now choose your own friends and don’t let the Society tell you who your friends ought to be. Life is good outside the WT.
Freetosee