Sometimes it’s not more ink that you need. Sometimes it’s less paper. Bleach, while not great for your stamps, has an awesome affect on your cardstock. You can create your own ink pad with a paper plate and some paper towels. Make the paper towel damp with bleach. (It is best to have a paper towel with no ink.) Then “ink” your stamp and place on cardstock. It will take a few minutes to dry and soak in.
Make sure when finished that you clean your stamps a bunch so there is no bleach residue left.
With inky fingers,