Here are the things I'd reflect on.
1) Precious human birth. You've gained an exceedingly rare birth as a human with knowledge of the Dhamma. This opportunity is not to be taken lightly. It's greater than winning the lottery, but you can easily waste this opportunity. You need to cease the opportunity and fully establish yourself on the path. Your primary focus should be this. If you miss this chance then you'll greatly regret it.
2) Reflect on the effort the Buddha put into his awakening. The Buddha was unrelenting in his quest for awakening. There was nothing that was going to stop him. His effort was superb. When I would think about this and reflect on the Buddha's effort it motivated me to sit everyday. Before, I would struggle with sitting daily and felt lazy about it, but when I thought about the effort the Buddha put in then I would often feel embarrassed by my laziness and it pushed me to practice. So, just reflect on the Buddha and his qualities and see if that helps your motivation.
3) Finally, just the uncertainty of samsara. If you strive for stream-entry then you'll be safe, but otherwise you're leaving things to chance and you don't know what around the next corner. No amount of worldly pleasures comes even close to gaining stream-entry. That doesn't mean you have to cut out all the enjoyment in your life and just practice 24/7, but you certainly need to put some serious effort into it. You have enough sense to be interested in the Dhamma...now don't go half way and then turn around....reach the end of the path.