Adding account team member on account object in Salesforce

`trigger TeamMemberTrg on Account (after insert) {
if(trigger.isinsert){
set parentIds = new set();
for(account acct:trigger.new){
if(acct.ParentId!=null && acct.VPA__c==false){
parentIds.add(acct.parentId);
}
}

if(!parentIds.isEmpty()){
map mpAccs = new map([select id, ownerId from Account where Id in: parentIds]);
List members = new List();
for(account acct:trigger.new){
if(acct.ParentId!=null && mpAccs.containsKey(acct.ParentId) && acct.VPA__c==false){
members.add(New AccountTeamMember(AccountId = acct.id, TeamMemberRole = 'Account Manager', UserId= mpAccs.get(acct.ParentId).OwnerId));
}
}

if(!members.isEmpty())
insert members;
}

}
}