Calling other script to post after other funcation

I want to call other script to start running every 1 second after the first one is called,

but am having a problem the above script doesn’t report any error in browser and its not working. it only do post call to first function.

but doesn’t call other one after is called

I want the first call to do post after then call other one to also do a post call, run every 1 second or call file2 every 1 second

and then when it reaches 5min do not do any post call on file2(stop calling)

<script>
            function Fun_1() {
                ("#MkB").click(function (event) {
                    Execute();
                });

                function Execute() {
                    .ajax({
                        type: "POST",
                        url: "file",
                        data: {
                            
                            textnum: ("input[name='textnum']").val(),
                           
                        },

                        beforeSend: function () {
                            if (("form input[name='textnum']").val() == "") {
                                ("#error").text("action needed.");
                                return false;
                            }
                            
                        },

                        complete: function () {
                            ("#error").hide();
                            
                        },

                        success: function (response) {
                            myVa = setTimeout(() => {
                                clearTimeout(myVar);
                            }, 300000);
                            setTimeout(Fun_2, 3000);
                        },
                        error: function () {
                            alert("Something has Happened");
                        },
                    });
                }
            }

            function Fun_2() {
                myVar = setTimeout(Fun_2, 1000);
                timeout: 300000,
                .ajax({
                    type: "POST",
                    url: "file2",                    
                    success: function (res) {
                         var Rmsg = res.msgEnd;
                        ("#FeMsg_1").html(res.msg);
                        
                        if (Rmsg == 'Complete') {
                         clearTimeout(myVar);
                         clearTimeout(myVa);
                    },
                });
            }

            (document).ready(function () {
                Fun_1();
            });
        </script>