I have below method where, there is a call to a database in AppendExpandOption2DataAsync & AppendExpandOption1DataAsync if the ODataQuery options is passed and valid. However, the data that OData needs is returned by GetMyData and thus the execution of AppendExpandOption2DataAsync & AppendExpandOption1DataAsync shoudl be hold until the GetData is returned, since GetData can also give a 500 or a 404. But my below approach is increasing latency as I am doing two DB calls. (1 for GetMyData & other for AppendExpandOption2DataAsync or AppendExpandOption1DataAsync). How can I optimize this code for minimal latency without changing its execution output.

public async Task<ResponseType> GetDataAsync(RequestType request, ODataQueryOptions<ResponseType>? options = null, string? version = null)
    {
        if (request == null) throw new ArgumentNullException(nameof(request));
    
       
        try
        {
            // Verify expand options
            IEnumerable<ExpandedNavigationSelectItem> expandOptions = options?.SelectExpand?.SelectExpandClause.SelectedItems.OfType<ExpandedNavigationSelectItem>();
    
            (string identifierName, string identifierId) = Utils.GetIdentifier(request);
            DataPreview dataPreview = await dataApiClient.GetMyData(identifierId, identifierName, version);
            ResponseType response = dataPreview.ConvertToResponse();
    
            List<Task> expandTasks = new List<Task>();
            expandOptions?
                .ToList()
                .ForEach(item =>
                {
                    if (item.PathToNavigationProperty.FirstSegment.Identifier.Equals("ExpandOption1", StringComparison.CurrentCultureIgnoreCase))
                    {
                        expandTasks.Add(AppendExpandOption1DataAsync(response));
                    }
                    else if (item.PathToNavigationProperty.FirstSegment.Identifier.Equals("ExpandOption2", StringComparison.CurrentCultureIgnoreCase))
                    {
                        expandTasks.Add(AppendExpandOption2DataAsync(response));
                    }
                });
    
            // Ensure all expand operations are completed
            await Task.WhenAll(expandTasks); 
            return response;
        }
    }