How Can I Improve My Chances of Entering Thailand on a Single Entry Tourist Visa?

The user is preparing to arrive in Bangkok on a single entry tourist visa and seeks advice on improving their chances of entry. They are bringing 20,000 baht in cash, print copies of their flight ticket back home, and a bank balance statement, but are unsure if they need anything else. Comments suggest including hotel reservations and inquire about the user's previous stay durations and nationality.