When a popular crypto project airdrops and causes network congestion, participants can take several steps. First, prepare in advance by ensuring their wallet is set up correctly and all required information is ready. Second, try to join the airdrop during off - peak hours if possible, as the network may be less congested. Third, be patient and keep retrying if submission fails initially. Also, closely follow the project's official channels for any updates or alternative instructions. By doing so, they can increase the likelihood of completing the airdrop process smoothly and avoid being left out.