Free up server memory space when idle

I have a code more or less with this structure:

package main

import (
    "html/template"
    "net/http"
    "log"
)

func main() {
    http.HandleFunc("/",taltal)
    http.ListenAndServe(":8080",nil)
}

func check(err error){
    if err != nil{
        log.Fatal(err)
    }
}

func taltal(w http.ResponseWriter, r *http.Request){
    if r.Method == "GET"{
        t,err := template.ParseFiles("request.html")
        check(err)
        t.Execute(w,nil)
    }
}

This code simply creates a server with whatever it has in the file request.html and it runs in localhost:8080 , see the routes I set in http.HandleFunc("/",taltal) .

I noticed that in the task manager, even when the server was idle, memory usage never decreased, it only increased according to the amount of calls I made to the server.

Initial status:

Aftermakingsomerequests:

And memory usage never slows, even when the server is idle.

How do I free the memory that is no longer being used and at the same time do not crash the server?