Freelancer startup billing per seat

Hi there,
I’ve recently started consulting as a freelancer after using previously in a marketing team. I really want to get access to some of the advanced features I have previously used for planning (in the Pro plan), however as a start up, having to buy 3 seats when I am only using one seems quite cost-prohibitive. It would be good if you can buy access to the Pro plan for just one seat.
thanks, Jo