how to loft this to make solid

First you must "center" all sketchs.
Then use only outline sketches with closed loops
and finally loft your sketches.

Answered with a tutorial: https://grabcad.com/tutorials/how-to-loft-this-to-make-solid

It seems that in every sketch too many contours. Try to make the principle: one sketch - one circuit.
Some of the sketches made by the subsidiary lines.

1

one more suggestion: the hull is simmetric, draw just one side centered with the longitudinal plane of the boat than mirror it.
it will be easer and faster

Thank you very much for help , will try like you suggested !!!