Optimize US TikTok Lead Campaign

I need to optimize my TikTok campaign to generate lead forms from the USA. Currently, I receive 100 leads per day at $30 from Africa and India, but I want to target the US instead.

Requirements:
- Target age group: 35 and up
- Interests: Fitness and Health, Technology and Gadgets
- Optimize for a US audience

Ideal skills and experience:
- Proven track record with TikTok campaigns
- Experience targeting US demographics
- Knowledge of fitness and tech markets
- Ability to optimize budget for better leads

Please provide examples of previous work and strategies.