Short answer: do it the legitimate, organized way — use proper business/secondary-account features, a password manager + MFA, clear separation (browser profiles or containers), and follow each service’s rules. Don’t try to hide or evade bans — that’s likely to get accounts flagged and can be a ToS or legal problem.

Concrete, practical steps

1. Decide the legitimate reason and use the right account type

• Use business/creator/agency accounts when available (e.g., Google Workspace, Meta Business/Ads Manager, Google Business Profile, social-platform “teams” or org features). These are designed for multiple people/accounts and reduce flags.
• If you need separate personal vs business identities, be explicit and keep each identity consistent with the platform’s rules.

2. Centralize access and inventory

• Keep a single inventory of every account (password manager with notes, or a secure spreadsheet). Record purpose, owner, recovery info, creation date, linked email/phone, and last-used date.
• Use role-based access: give team members only the access they need and revoke promptly when no longer required.

3. Use a good password manager

• Generate and store unique, strong passwords for every account (1Password, Bitwarden, LastPass, etc.). Avoid re-using passwords across accounts.
• Use secure sharing features in the manager if multiple people need access.

4. Enforce multi-factor authentication (MFA)

• Require MFA for all accounts. Prefer app-based authenticators (Authy, Google Authenticator) or hardware security keys (YubiKey) where supported.
• Store recovery codes securely and rotate them if you suspect compromise.

5. Keep identity signals consistent (to avoid looking suspicious)

• Use consistent, verifiable business information where applicable (display names, business address, tax/registration info).
• Don’t constantly change email/phone, profile pictures, or IP/geolocation in ways that look like abuse.
• Use legitimate, stable contact methods (company phone numbers, official emails).

6. Use browser profiles or containerization

• Use separate browser profiles (Chrome profiles, Firefox profiles) or extensions like Firefox Multi-Account Containers to keep cookies/sessions separated without constantly logging in/out.
• For teams, use separate OS-level users or VMs if you need stronger separation.

7. Use SSO / identity providers for many accounts

• Where possible, use SSO (Google Workspace, Microsoft Entra ID/Azure AD, Okta) to manage many identities and enforce security policies centrally.

8. Use official APIs and delegated access, not fake accounts or scraping

• Use platform APIs and OAuth tokens for automation and scheduling. Respect rate limits and terms of service.
• Use platform-approved management tools (e.g., social media schedulers that support business accounts) rather than scripting logins or creating phantom accounts.

9. Be careful with phone numbers and email aliases

• Use proper email aliases/plus-addressing (Gmail supports +aliases) or separate business domains.
• For legitimate multiple numbers, use company phone lines or reputable VoIP providers. Avoid transient/throwaway phone numbers if the platform forbids them — those often trigger flags.

10. Network and device hygiene

• Avoid constantly switching IPs or using suspicious IP ranges (some data-center proxies are high-risk).
• If you need privacy, use a stable commercial VPN rather than randomized proxy pools; check the platform’s policy.
• Keep devices updated and scanned for malware.

11. Monitor, audit, and retire

• Regularly audit account activity and access logs. Revoke unused access and delete unneeded accounts.
• Keep backups of recovery information in secure storage (encrypted vault).

12. What to avoid (and why)

• Don’t create duplicate accounts to evade bans, manipulate reviews/engagement, or deceive people. That behavior commonly triggers platform flags and can lead to permanent bans or legal issues.
• Don’t use bot farms, rotating IP pools, or throwaway phone/email services to hide identity — those are high-risk for detection.
• Don’t share passwords insecurely (email, chat) — use a password manager with secure sharing.

Quick checklist to implement right now

• Put every account into a password manager and enable MFA.
• Create an access inventory and tag each account with its purpose and owner.
• Migrate accounts that should be “business” into appropriate business/organization features.
• Set up browser profiles or containers for separation.
• Stop any automation that uses scripted logins or proxy rotation and move to official APIs.

If you want, tell me what kinds of accounts (social media, cloud services, email, marketplaces) and whether this is for one person or a team, and I can give a tailored checklist and recommended tools/processes. (I will not help with evading bans or creating deceptive/sockpuppet accounts.)