How do I fix extremely frizzy, unmanageable hair? Need product + routine advice

How can I achieve healthy hair like the ones shown in the next slides of my photos? I’ve been really stressed about my hair lately—to the point that I always keep it in a ponytail because it’s extremely frizzy and hard to manage.

What products would you recommend, and could you share a step-by-step routine on how to properly use them?

I’m also open to any hair treatments, as long as it’s not rebonding 😭

PS: I live in the Philippines, so the weather (humidity, heat, etc.) might be a factor too.

Thank you so much to anyone who responds. Happy holidays!