How to add my port 8888 to cloudflare with spectrum

how to add my port 8888 to cloudflare with spectrum and is spectrum free or premium ?

Only an Enterprise plan can add that port to Spectrum. Entry-level Spectrum only proxies SSH (22) and Minecraft (25565).

is there any way else i can use to allow my port 8888 ???

You can try the Portzilla app: