.then() gets pretty old pretty fast

promises.js

  Promise.resolve(skipPosting)
  .then((res) => {
    if ( res === 'skipPosting' ) {
      throw new Error('skipPosting');
    }
  })
  .then(() => {
    const fromTs = ...;
    let countOfQuestions = ...;
    queryQuestions.get().then((querySnapshot) => {
      querySnapshot.forEach((documentSnapshot) => {
        countOfQuestions += 1;
      });
    })
    .then(() => {
      if (countOfQuestions === 0) {
        msg.push(`...`);
      }
    })
    .then(() => {
      let countOfAnswered = 0;
      queryHero.get().then((querySnapshot) => {
        querySnapshot.forEach((documentSnapshot) => {
          const isResolvedAction = ...;
          if (isResolvedAction) {
            countOfAnswered += 1;
            // ...
          }
        });
      }).then(() => {
      ...
      ...
      ...