Optimizing API integration for country code lookup efficiency?

hey everyone, we've built 'Country Codes Directory', a web tool providing international phone, calling, dialing, and ISO codes. our current API integration uses a cached external service for dynamic lookups.

• the problem is, we're hitting rate limits on our external api services during peak hours, despite our caching stratagy, impacting real-time lookups.
• beyond basic caching or costly rate limit increases, what advanced strategies exist for optimizing real-time API integration performance for large-scale, high-frequency data lookups? like predictive caching, request batching, or even edge computing for these *api services*?

thanks in advance!