Success comes in waves and you are beginning to understand that you will always have a reason to celebrate. Even in the darkest times.
Motivation is not an endless stream that goes on forever. It's a muscle that you have to exercise on a daily basis. Just as a battery needs to be recharged, so does your motivation. Don't get upset or frustrated with yourself when your motivation runs low - you just need to recharge it. It's the same for all of us.
Getting to know colleagues who have similar interests, backgrounds or hobbies can be a great way to create a supportive circle of productive relationships.