You say you arrived into Thailand in 15 November 2018 and plan to live in Thailand until 30 September, 2019 using 30.days exempt entries with extensions and an Ed Visa. Now you want a Tourist Visa. Frankly speaking with your entry history, and will have lived in Thailand 10
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months, I think you are at greater risk of questioning by Thai Immigration. Be prepared if asked to show 20,000 Thai baht CASH or equivalent, proof of planned stay and TICKET for onward travel OUT of Thailand.
Even with a valid issued Tourist Visa, the decision to allow you reentry is up to the Immigration Officer upon your arrival.