Are there tools out there to make it easier for a single owner operators in a niche business in the hobby industry to crosspost to mastodon and pixelfed (and maybe others) about their business?

I have a client who used to do most of their marketing successfully through Instagram until the Meta algorithm changes. In the last couple of years, it’s been a desert for sales. I’ve talked about the fediverse but they’re reluctant largely because they’re used to using existing cross platform posting tools from Meta. They don’t want to have to individually post to multiple systems.

Thoughts?