Bundling multiple off-chain signed transactions and broadcasting them at once on-chain

Hi, this is a question about meta transactions. I'm building a dapp that uses meta txs with moralis and biconomy. I wanted to know how to send all signed transactions bundled to one meta transaction instead of one at a time? For example, if there is a function like "enter the contest", I wanted to get all signed transactions from the users first, and then broadcast them at once onchain