How to maintain long life starter year and years

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So it only CLICKS! Is the "New Battery" fully Charged? Are the Battery Cable terminals properly cleaned and tightened? Check the Voltage with a Multi-meter and insure that at least 13 Volts is present. If that is OK then your Starter Solenoid is no longer engaging it's contact plate with the Battery Terminal and the Starter windings. Some times the Brushes inside the Starter wear out and no longer make contact with the armature, This condition would require rebuild or replacement with a re-manufactured or new starter. You may just have a Battery that is at the end of it's "Life Cycle".

I would take the starter out and have it bench tested to verify if it has gone bad in the mean time.

Check the battery for bad connections and also for a full charge.

Check that the battery connections are clean and shiny and new looking when removed from the battery.

How old is the battery? 3 years is a typical life of most batteries sold and installed in cars these days. If unsure, then try a new one from the store which is fully charged to test, or connect a battery charger to your existing battery to see if it will take a charge.

Trickle charge your battery for up to 3 days to get a full charge on it.

Good luck on this repair.

There is always the chance that when removing your leads that one or both of them is no longer fitting tightly on the cable.

On the other hand, since your battery is old enough to have had corrosion needing attention with a wire brush then perhaps it is TOO old and needs to be replaced.

Your starter is bad....period.