Happiness is a chocolatey drink on a decent day...sans spillage.
Those who complain about life not being interesting enough usually find themselves trying too hard. We all do it. To get over it requires a willingness to set various goals and priorities. When the mind is not so focused on the struggle of happiness, life's passions will pave most of the way. I can only speak for myself, but I believe I am achieving that right now. Everyone slips away from that contentment when things feel too comfortable, but that must happen to remind ourselves where are aspirations lie. Nothing will ever be--nor feel--perfect for long, and that's okay. There will always be a premium blend of satisfaction and struggle; only how homogenized the blend will vary. The satisfaction of struggle and the struggle of achieving it--it tastes quite rich.