Reach lowered last few months

At the end of the day, we would post one big tweet that would generate reach. Whenever we opened up twitter from one of our other accounts, this tweet would always be the first thing shown.

We have accounts that all they do is like these tweets so it showed up only our main accounts tweets when opened.

Starting a few months ago this stopped happening. Reach declined, the tweet never shows when twitter is opened from one of these accounts. It's hurting sales big time.

Any thoughts?

What software did you use to control these alt accounts to boost the popularity of the main account?

Combation of VPN's, proxies and multipe browsers