Farming of accounts does not matter, however, it is good practice to keep your accounts farmed and warm. Speaking from personal experience, I have delivered reviews from fresh accounts and none of them got removed till date. On the other hand, I have also used around 5+years old accounts with good history of reviews (local guide level 6 - 7) but reviews got flushed within 24 hours.
Try these :
1. Check the proxies or VPN you are using. Use private dedicated or residential proxies. Keep switching VPN's time to time because at one point, IPs provided by VPN gets flagged.
2. If you are using the account on mobile device, use same email to sign up on other apps like YT, Drive, Maps, FB, music apps, Yelp, TA and keep doing some activities mimicking a real person. Check ins, route search, Q&A, watch videos etc.
3. Post maximum 2 reviews a day on single listing. Somedays 3 but keep the numbers random and slow.
4. Include helpful in-depth details, like the benefits or drawbacks of a certain item, specifics on how a product performs or how the product differs from previous versions.
5. Include unique information beyond what the manufacturer provides — like visuals, audio or links to other content detailing the reviewer’s experience.