Your most expensive plan is for a team of 40-100 people. For the sake of simplicity, you are talking about a team that is costing a company a minimum of say $1,200,000 a year (assuming $15/hr FTE's) and you are asking them to pay you $300 a year for a tool they are supposed to use throughout the day.
Why have you built such a low value tool?
Take your prices and multiply by 10 and you are probably at a more correct pricing strategy if you are selling to businesses.