onTimeout and is not function error using node js

I am trying to call an async function inside the setInterval by passing two arguments originalDetails and filePath. so I created a function with the name createUser and in the same function, I am adding the setInterval with 3 sec as finDetails() needs some delay to execute that function. I am getting the error as await self.gotUser(originalDetails) is not a function. Why I am getting this error I don't know

my code is as follows:-

const findDetails = require("./findDetails");

async createUser(originalDetails,filePath){
 return new Promise(async (resolve reject)=>{
  
  findDetails(filePath);

  setInterval(this.findUser,3000,originalDetails,filePath);
 })
}

async findUser(originalDetails,filePath){
 return new Promise(async (resolve reject)=>{
  // some code here

  var self=this;

  await self.gotUser(originalDetails); // I am getting error here in this part
  return resolve();
 });
}

async gotUser(originalDetails){
 return new Promise(async (resolve, reject)=>{
 let inputValue;
 // some coding part here

 return resolve();
 });
}

I have tried the code by writing both self and this still I'm getting the same issue

and this is my error message look likes

error message

/Users/servive_project/provide_service.js:300:18
      await self.gotUser(originalDetails);
                 ^

TypeError: self.gotUser is not a function
    at /Users/servive_project/provide_service.js:300:18
    at new Promise (<anonymous>)
    at Timeout.createUser [as _onTimeout] (/Users/servive_project/provide_service.js:288:12)
    at listOnTimeout (node:internal/timers:561:11)
    at processTimers (node:internal/timers:502:7)

getting two error at a same time

1. self.gotUser is not a function.
2. Timeout.createUser [as _onTimeout].