Or you stockpile a crapload of drinks like I did. Reaching T1000 for 250 stars really isn't that hard for a free player. At the very least, all you need is five 3*s of the event's type and mostly levelled up items, then consistently play every 5 hours.To be honest the reward for reaching a high rank in events isn't worth it for me. Presumably it costs a lot of stars/money to have to continually use boosts and also you have to play non-stop. I'll take my top 5000/10000 with not much effort and use the stars for gacha.