I have three useful supports, where should they go?

Context: I’m a low spender who started playing on Mydei banner, I pulled for Castorice, and intend to pull Hyacine so I can have 2 good sustains. I’m going to eventually have ReMC, I have Pela and Ruan Mei, so given that my final teams will be:

Castorice | Support | Support | Hyacine

and

Therta | 4 Star Erudition | Support | Gallagher

How do I allocate my supports?