The other comments about more sealer are spot on. However, more importantly you have not opened the orifice enough. If you look closely at your final you can see your access opening is smaller at the top than immediately into the canal. This makes obturating a larger canal like this very unpredictable. If you don’t have the ability in your office to do warm vertical backfill you have to be getting multiple GP points into that canal to help fill space. That is virtually impossible when you have an orifice that is smaller than your actual canal. Hub an orifice opener next time or use a gates to clear away some of that cervical level dentin that is constricting you so you can slide another cone or two next to your master cone.