Proposed

Context: Following up on the prospect regarding his interest shown in the marketing campaign.

Hello Bob,

I hope you are well.

I had proposed to you regarding the marketing campaign for your product a few months ago/some time ago. At that time, you seemed not interested in it. I am now checking with you whether anything has changed in it.

I am looking forward to hearing from you.

Thanks

Kumar

Please suggest "had proposed to" "seemed not " "whether anything has changed in it".

If you don't mind, please change it to a formal email.