If someone suspects their wealth isn’t entirely halal, they should:

1. Seek knowledge: Consult Islamic scholars or financial experts well-versed in Islamic law.

2. Reflect and identify: Determine which specific assets or sources of income may be questionable.

3. Purify wealth: Donate suspected ill-gotten gains to charity, without seeking reward.

4. Repent and resolve: Make a firm commitment to ensure future earnings comply with Islamic principles.

5. Future compliance: Implement Islamic financial practices, consulting experts as needed.

6. Ongoing vigilance: Regularly assess and adjust financial dealings to maintain halal status.

Remember, sincerity and efforts to rectify past wrongs are essential.