I just learned of this cross posting, but I wanted to mention that tools like Hootsuite or Buffer work can aggregate your post to different platforms. Also, there is a WordPress plugin or two that will aggregate your posts. After all the end result should be more views, so building lists on every platform in volume could make sense from my perspective. Though there are many with not enough views generated to make a difference. Some places are just better targeting. Volume metrics you can get from most any keyword tool. Google trends is a good too, there's tons of AI software now, but I can still use freelancers. Lots of them are just operating software too.