Star scarve

I’m creating a scarf pattern with two colors so the triangles are the blue and the * are yellow so when I neend the yellow how do I carry it because I don’t want to cut the yarn all the time .

This design is really better with intarsia. So instead of carrying the blue across the yellow star, you can use separate balls or butterflies of blue and yellow as needed.

I don’t mind carrying the yarn if anyone else has any thing to add please do

Question if I wanred to use fair isle knitting what kind of cast on should I use