There’s definitely no such thing as Pinning too much. But we prefer consistency to volume.
It’s better to pin a similar number of times per day than to Pin a ton at once, and then nothing. Try to spread out your Pinning on daily basis.
The easiest way to accomplish this is with Tailwind. With Tailwind, you can schedule your Pins for the week (or longer), and they’ll be posted for you automatically.
Don’t inundate your followers with your own Pins. If they use the new following tab, your Pins will be seen in the order that you save them. If you add lots of duplicate content in succession, your followers may well take this as a cue to unfollow you.