I ask the players to declare what action they’re taking (e.g. Attack, Cast a Spell, Dash, Disengage, Help, Hide, Ready, Search, Use an Item, or an improvised action). I assume everyone is going to move. You decide when your Initiative comes up where you move and what you attack. I use a mix of grid-based combat and TotM.So you’re asking the players to make specific decisions, but all of the goblins are just “continuing their assault”?
Wait... I’m thinking in terms of miniatures. It matters whether each goblin moves or attacks. Are you using theatre of the mind only?