Optimization of code using multithreading or other techniques in NodeJS

Question

I am doing a project that involves getting data from blockchain and sending data to it as well. However, I am a beginner on NodeJs and was stuck on an issue.

A certain portion of code roughly looks like this:

  try {
    for await (let user of users) { //users is an array with details of 5k+ users
      var balance = await callBlockChainFunction(payload); //Get data from blockchain
      //Do certain operations on balance
      txHash = await callBlockChainFunction2(balance); //Post data to blockchain
    }
  } catch (e) {
    console.log(e);
  } finally {
   //upload log to S3 bucket
  }

The callBlockChainFunction2 function takes around 5 seconds or more for response and overall this code takes 3 hours+ to run. How do I optimize this? Any points or guides to relevant resources would help a lot. Thanks.