To complete a high bonus rollover, you should first carefully review the terms and conditions of the bonus offer. Ensure that you understand the wagering requirements, which typically involve betting a certain amount of money before being eligible to withdraw any winnings. It is recommended to play games with a high return to player (RTP) percentage to improve your chances of meeting the rollover requirements. Additionally, consider diversifying your bets across different games to spread your risk and potentially enhance your chances of winning. Remember to gamble responsibly and within your financial limits.