I've been teaching TEFL in Thailand for nearly 20 years, also after completing a CELTA. Not sure why you went down the kindergarten route, as the CELTA course is specifically for teaching English to adults. There are lots of language school opportunities in Bangkok and in other provinces where you can focus on teaching adults (sometimes older teenagers) rather than young children. You won't earn much to start, although my starting salary back in 2005 was 34,000 baht a month, which is what some places seem to be paying now. The higher quality language institutes (British Council, AUA, ECC, Wall Street, New Cambridge) will start you on a much higher rate.