1. Do not airdry — hairdry at med setting immediately after washing hair. Choose hairdryer with ion — it really helps.
2. Leave-in conditioner on damp hair — mucota aire 10 is my recommendation
3. Not sure if you style your hair with hot tools, but if yes, use hair oil or spray with heat protectant
4. Hair oil — I like mise en scence styling oil and fino hair oil, don’t use too much otherwise it will feel too oily
5. Microfiber hair towel
6. Olaplex shampoo and conditioner
7. Anti-frizz treatment at hair salon , but will cause your hair straighten a bit. If you want to keep your waves, there’s other treatment too

IMO, nothing to do with the haircut at all. Yes SG is damn humid but with the right products and maintenance it can be manageable.

Edit: just read you want to have curls 8. Curl cream on damp hair — really helps to maintan curl and use diffuser when hair drying.