95 Dodge Caravan won't start

Hi! My 95 Caravan starter quit. I replaced the starter relay and that worked just fine for a couple days. When It happened again, I replaced the relay several times, but the best I could get is a short weak click from the starter. Where do I start to trouble shoot this?

Replace the starter.

When you start the car, the solinoid on the starter pushes the drive gear into the flywheel. You hear the "clicking" noise then. The drive gear must engage fully. Only then does the contacts in the starter relay engage and supply high voltage to the starter.
The usual problem is that the starter's drive gear is worn/damaged from repeatedly striking the flywheel.