How to retrieve data from table after submitting form

I am having issue while fetching data once form submission happens. I am able to fetch records if I use view->with() but when I refresh It generates error due to dependency of table as resubmission happens. I want fetch some data once form submission will be completed and redirect will be done. Here Is my controller -

**public function postNewProject(Request $request){
        $client_id = (int)session('clid');
        $subclient_id=(int)session('subclientid');
        $innvation_sponser=$request->get('innvation_sponser');
        $innovation_champion=$request->get('innovation_champion');
        $department=$request->get('department');
        $projectname=$request->get('projectname');
        $championemail=$request->get('championemail');
        $championphone=$request->get('championphone');
        $startenddate=$request->get('startenddate');
        $connecteddate = str_replace(' ', '', $startenddate);
        $splitteddate = explode("-", $connecteddate);
        $start_date=$splitteddate[0];
        $end_date=$splitteddate[1];
        $usable_start_date=date_create(date($start_date));
        $usable_end_date=date_create(date($end_date));
        innomantraprojects::create([
            'client_id' => $client_id,
            'subclient_id'=>$subclient_id,
            'innvation_sponser'=>$innvation_sponser,
            'innovation_champion'=>$innovation_champion,
            'department'=>$department,
            'projectname'=>$projectname,
            'championemail'=>$championemail,
            'championphone'=>$championphone,
            'start_date'=>$usable_start_date,
            'end_date'=>$usable_end_date,
        ]);
        // $subclients = DB::table('subclients')->where('client_id',$client_id)->get();
        // $projectlist=DB::table('innomantraproject')->where('client_id',$client_id)->get();
        // return view('project-list')->with('subclients',$subclients)->with('projectlist',$projectlist);
        return redirect('project-list');
    }
}**

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