Execute class methods in random order - JavaScript

Question

I need to execute all methods in random order from main_method (i will create a class instance later).
But when first function start executing it shows that "this" inside her is equal undefined.
How can i fix this? Thx

class test {
 construstor(smth) {
  this.smth = smth
 }
 async main_method {
  for (let func of [this.#method1, this.#method2, this.#method3].sort(() => Math.random() - 0.5 )) {
    await func(this.smth);
  }
 }
 async #method1(smth) {
 // this === undefined
  ///
 }
 async #method2(smth) {
  // this === undefined
  ///
 }
 async #method3(smth) {
  // this === undefined
  ///
 }
}