Try posting on different classified platforms. Some airsoft centric ones are
https://old.reddit.com/r/airsoftmarketcanada or HopUp on mobile.
Also keep in mind your for sale posted is still pretty fresh; some items on the For Sale classified can still be up for sale for
MONTHS (some having 2+ pages worth of weekly bumps).
It really is just a matter of pricing and luck to sell fast (within a week).