According to Reuters over the last month either one, or both, analysts covering the stock have dropped their rating of TRA.
They've gone from 1 x Buy and 1 x Outperform to 1 x Outperform and 1 x Hold.
I'm not sure how much influence they have in NZ but it possibly goes some way to explain the recent demise in the share price?
https://www.reuters.com/finance/stocks/analyst/TRA.NZ
As for calls for the brokers to get stuck in and boost the share price. That makes no real sense to long term holders. The more TRA they buy at the bottom the more shares they get for their money.