Monstera Deliciosa, its parent plant, is native to the tropics, where it receives plenty of bright light filtered through the canopies. As a result, the Thai Constellation Monstera requires the same, if not more, bright indirect light.
Adding bark and perlite to a high-quality indoor potting mix will help significantly improve drainage. I also like to add worm castings to my soil mixes every spring to help with nutrients. Remember that these plants are highly susceptible to root rot, so dense, heavy soil is a huge no-go.
Thai Constellation plants are epiphytic, meaning they grow on top of other plants and take nutrients from them, so you should also add organic matter to your soil for the best possible results.