I'm afraid that when the ramadan is gone, i'm going to lose my iman? :(?

Remember that Ramadan is a month we use to refuel our spirituality tank to help us last another 11 months, so don't tell yourself that it will be over and you will revert to how you were in the past. A trick I learned is to keep up everything you were doing for Ramadan for the first 10 days after Ramadan is over. It really works at keeping you at the pace you are at now. Give that a shot.