I have a apex Trigger on contact if we have contact related account the number of opportunities will be updated in amount like amount = no.of contacts*1000 
trigger trigoncontact on Contact (after insert, after delete) {
    List<Opportunity> opportunitiesToUpdate = new List<Opportunity>();
    
    Set<Id> accountIds = new Set<Id>();
    
    if (Trigger.isInsert) {
        for (Contact contact : Trigger.new) {
            accountIds.add(contact.AccountId);
        }
    }
    
    if (Trigger.isDelete) {
        for (Contact contact : Trigger.old) {
            accountIds.add(contact.AccountId);
        }
    }
    
    List<Account> accounts = [SELECT Id, (SELECT Id, Amount FROM Opportunities), (SELECT Id FROM Contacts) FROM Account WHERE Id IN :accountIds];
    
    for (Account acc : accounts) {
        List<Contact> contacts = acc.Contacts;
        List<Opportunity> opportunities = acc.Opportunities;
        
        for (Opportunity opportunity : opportunities) {
            opportunity.Amount = contacts.size() * 1000;
            opportunitiesToUpdate.add(opportunity);
        }
    }
    
    update opportunitiesToUpdate;
}

now I want to create salesforce flow for whenever a new opportunity is created at that time also amount should be updated on opportunity. can anyone help how to do that ?


Thanks,