Personally, I find cold calling to be annoying. I get a lot of spam calls and I find it very hard to trust anyone that calls my number without me having any history with them.
That said, I think the best product or service to sell through cold calling is something that the older generation might be able to benefit from that they might find trouble discovering on their own. I think the younger population wouldn't trust an unexpected caller as they are more comfortable with digital communication where they can see your history and track record at a glimpse.
I think the best product or service would be one where a lot of trust or comparison-shopping isn't required. For example, I wouldn't try to sell phones or appliances. Instead I think something that the retired demographic can benefit from if you can spare them the effort of finding it themselves.
The best example I can think of would be to offered retired homeowners snowplow services, lawn moving services, grocery pickup services, etc. Things they may need, but not know how to find someone and they can pay as the job gets done using a payment method they feel comfortable with. If you reach out at the right time, you may actually be solving a real problem for them that they just haven't set aside the time to solve yet.
Are you targeting businesses that want to generate blog posts for SEO reasons and don't have the time to write them? I'm trying to understand the problem you want to solve with this.
If you're talking about using a tool where you can fill out a form and then that feeds into something like ChatGPT to auto-generate content, then definitely not. I think there's too much content like that online and suspect it may even get detected by crawlers and be a negative ranking factor. The key to differentiate ourselves is to actually try to connect with our clients and provide real value.