<?php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class AddNominationLimit extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table("users", function(Blueprint $table)
        {
            $table->bigInteger("nomination_limit")->default(0);
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table("users", function(Blueprint $table)
        {
           $table->removeColumn("nomination_limit");
        });
    }
}

<?php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class AddNominationLimit extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table("users", function(Blueprint $table)
        {
            $table->bigInteger("nomination_limit")->default(5);
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table("users", function(Blueprint $table)
        {
           $table->removeColumn("nomination_limit");
        });
    }
}

Set default nomination limit to 5
Set default nomination limit to 5
