What is the most logical next event?

How to make a basement french drain
Plot out and mark the path of the french drain.
The drain should run about 1 foot (or 30 cm) away from the basement's exterior wall. Place it in the area with the greatest moisture.
It should run to a collection basin in the basement (ideally placed in a corner), from which a sump pump will expel the water to the outside. Dig out the floor of your basement along the path of the drain.