What I wanted: Summer Tomoe 3* without spending all of my 10k

What I got before this fucking solo: DF Rimi, DFv2 Ako, Cooking class Tsugu and Comic Tsugu and 7.5k worth of stars wasted

Now I need to save 15k before October... Help me???

ngl I wish I hadn't spent so much and just waited for a rerun but... It's my fave Tomoe costume after the sasanqua card so it's worth it ig