Two primary factors are considered when Cache is allocating capacity for high-demand stocks (eg SPCX, AAPL, NVDA, GOOG/L, AVGO).

Single stock vs Multiple stocks: An investor bringing a single high-demand stock like Apple competes directly with every other Apple holder for the same slice of capacity. A investor bringing Apple alongside JP Morgan and Costco, for example, receives higher overall priority because the diversified basket is more useful to the fund.

If you hold multiple concentrated positions, contributing them together is worth considering. It improves your standing in the allocation queue and reduces the risk of missing capacity on your primary stock.
Time: Investors who transferred earlier receive priority over those who transfer later. Getting your assets onto the platform ahead of a close puts you ahead of anyone who arrives after you.

For more on how Cache's investment algorithm builds each fund and determines overall fund size, see How does Cache determine who gets an allocation and how big each fund is?