Please reach out to developers@strava.com for this request!
Your current athlete limit shows as 1. On the Getting Started Basic Info page, it tells you to fill out the form to get approved for more than one user:
Strava API usage is limited on a per-application basis using both a 15-minute and daily request limit. The default rate limit allows 200 requests every 15 minutes, with up to 2,000 requests per day.
If you’re looking to connect our athlete community to your app, and aren’t just developing for yourself, with your own data, please submit your app for review!