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Recommendations for reducing the risk of bans and other restrictions:

• Logging in from an IP address matching the registration region reduces the risk of additional checks. Avoid public and suspicious IPs; use quality proxies and an anti-detect browser.
• Do not log in from different devices and IPs at the same time, and avoid sudden geolocation changes.
• Do not start active use immediately after login. Give the account time to adapt before adding load.
• Increase activity gradually: connecting to services, sending emails, and working through clients without sudden spikes.
• Do not use mass mailing or automation without warming up the account first.
• Follow Yahoo rules: avoid spam and suspicious activity.

And do not forget about behavioral factors. Act like a regular user, not like a bot or marketer. And remember, do not use the account for fraud or deception — this is illegal.