It's been a while since I looked through my stamina pots and skip tickets. Turns out I have a lot and I'm gaining more than I use, so I guess they can be useful here if need be.

Btw, to whoever advised me to put together a solar team for the mechanical castle - thank you. They absolutely shred those pests.
I picked up 5 solar 6* memories, put them on Soyogo, Viola (Yukata), Mimosa, Ghost Weed and Hanamizuki and now I'm going through those stages I didn't manage to 10k.