How do I allow all users to use this apex? It's currently restricted to my community users.

public without sharing class EventActions 
{
  public static void SetAccountUsedSessions(List<Event> events)
  {
    Set<Id> accountIds = new Set<Id>();
    for(Event event : events)
    {
      if(event.AccountId!=null && !accountIds.contains(event.AccountId)) accountIds.add(event.AccountId);
    }
    if(accountIds!=null&&accountIds.size()>0)
    {
      Map<Id, Account> accountsToUpdate = new Map<Id, Account>();
      AggregateResult[] countResults = [SELECT AccountId, count(Id)cnt FROM Event WHERE AccountId IN :accountIds  AND IsRecurrence=false AND Subject LIKE 'PT%' AND ActivityDate <= TODAY AND EVENT_STATUS1__C <> 'Cancelled WITH 24hr Notice' GROUP BY AccountId];
      if(countResults!=null&&countResults.size()>0)
      {
        for (AggregateResult ar : countResults)  {
          String accountId = String.ValueOf(ar.get('AccountId'));
          String usedSessions = String.ValueOf(ar.get('cnt'));
          if(accountId!=null&&accountId!=''&&usedSessions!=null&&usedSessions!='')
          {
            Account account = new Account(Id=accountId);
            account.Used_Sessions__c = integer.valueOf(usedSessions);
            accountsToUpdate.put(account.Id, account);
          }
        }    
      }
      for(Id accountId : accountIds)
      {
        if(!accountsToUpdate.containsKey(accountId))
        {
          Account account = new Account(Id=accountId);
          account.Used_Sessions__c = 0;
          accountsToUpdate.put(accountId, account);
        }
      }
      if(accountsToUpdate!=null&&accountsToUpdate.values().size()>0) update accountsToUpdate.values();
    }
  }
  
  public static testMethod void Test()
  {
    List<Event> events = [SELECT Id, WhatId, AccountId FROM Event WHERE AccountId<>null 
      AND IsRecurrence=true AND Subject LIKE 'PT%' LIMIT 10];
    Event events2 = [SELECT Id, WhatId, AccountId FROM Event WHERE AccountId<>null 
      AND IsRecurrence=false AND EndDateTime > :system.today().toStartOfWeek() LIMIT 1];
    
    Profile sysAdminProfile = [SELECT Id FROM Profile WHERE Name='Corporate' LIMIT 1];
    
    User u = [select Id from User where IsActive = true and UserType = 'Standard' 
      and ProfileId != :sysAdminProfile.Id limit 1];
    System.runAs(u) {
    
      SetAccountUsedSessions(events); 
      update events2;
      delete events2;
    }
    
  }
}