The HTTP 429 error has the potential to interfere with the normal functioning of an application or a server. But it is not something that cannot be fixed! In order to troubleshoot the error code 429:
1. Respect Rate Limits
2. Block Bots
3. Optimize Your Database
4. Apply Rate Limiting on Client Side
5. Use CDN
6. Change Your Default WordPress Login URL
7. Clear the Browser’s Cache
8. Delete DNS Cache
9. Limit Brute-Force Attacks