Folding w/ Drops

I have an old folding bike na gusto ko sana i-upgrade ng konti. It was my first bike so medyo low specs sya at is but it has some sentimental value. Mostly stock sya na (Trinx Dolphin 2.0)[https://s.shopee.ph/6AV8vCbaUy] and gusto ko sya irestore and convert to a drop bar. Kahit na yung budget group set lang, okay na din.

Asking for tips on how I should proceed with the conversion? What parts I should buy?