I have issues on backing up my chat on iCloud for months now

Hello ayodele264,

Thanks for choosing the Apple Support Communities. We see you're experiencing issues with Messages or WhatsApp, and iCloud. If you are trying to back up your Messages, or use Messages in iCloud, try following the resource below.

Set up iCloud for Messages on all your devices - Apple Support

If you are referring to WhatsApp, you would want to contact WhatsApp Support by following this link: WhatsApp Help Center

We hope this helps.

Cheers!