Based on comments, you want to install an unswitched outlet next to the switch. Since you have confirmed that you have neutral in the box, that should be straightforward:
Unless the circuit is already GFCI protected, you MUST use a GFCI receptacle. The following is based on a typical GFCI receptacle.
Add two pigtails on the incoming hot wire with a wire nut. Connect one to the switch (where the incoming hot was previously connected) and one to the hot screw on the LINE side of the receptacle.
Add a pigtail to the neutral bunch and connect it to the neutral screw on the LINE side of the receptacle.
Add a ground wire to the rest of grounds and connect it to the ground screw on the receptacle.