How to make game-ready topology for meshes like that?

https://preview.redd.it/xhtzn29tk55h1.png?width=2559&format=png&auto=webp&s=a60b32d69a1381bcc273ab1b37cabf4281e605d2

I've studied today how to make retopology from HP to LP, but approach which author ideally fit flat surfaces. I've understood that and used it, but when I met this, don't really know what to do. Maybe someone can help me and give advice how to make game-ready topology for curve meshes like this