Hey man!
If you mean 65.8 kg (145 lbs), it seems like you're actually at a healthy weight. If anything, I would suggest resistance training. Building muscle helps you burn calories at rest. However, one thing that REALLY helps to maintain your weight is simply drinking enough water. Staying hydrated is essential to maintaining your health and keeping yourself satiated in between meals. Sometimes, the majority of excess calories comes from highly concentrated fruit juices and soft drinks. Hope this helps!