My battery is at 93 percent. Should I replace it or wen should I replace it?

Depends on your needs. If you absolutely need a 100% new battery with full capacity, are willing to pay for it, and Apple does battery only replacement, you should be able to request that.

However, in some countries, Apple’s only “battery replacement service” consists of complete replacement for the equivalent price of a battery replacement, where they might be hesitant to do it unless it’s under the 80% battery health where Apple considers it depleted.

The battery is ok. Any number above 80% usually supports normal peak performance.