if you like you can create another account on the switch console (free) and begin a playthrough of scarlet/violet. then you can use pokemon home to transfer 30 pokemon at a time (unless you pay lol) that you wouldnt like to keep in your main account. putting one pokemon in each of the 8 base boxes increases storage, as does connecting to pokemon home (iirc)
i did this to transfer my 400-strong living dex to a separate account to free ~14 boxes of storage for the new dlc.