NavigationMixin.GenerateUrl can be used to generate URL and window.open can be use to open the generated URL o refresh cache when using Lightning Navigation in Lightning Web Component in Salesforce.

Sample Code:

HTML:

<template>    
    <lightning-button variant="brand" label="Cancel" onclick={cancel}>
    </lightning-button>
</template>

JavaScript:

import { LightningElement, api } from 'lwc';
import { NavigationMixin } from 'lightning/navigation';

export default class NewEmployeeChild extends  NavigationMixin( LightningElement ) {

    @api accountId;
    accountURL;
    url;

    connectedCallback() {
        
        this.accountURL = {
            type: 'standard__recordPage',
            attributes: {
                recordId: this.accountId,
                objectApiName: 'Account',
                actionName: 'view'
            }
        };
        this[ NavigationMixin.GenerateUrl ]( this.accountURL )
            .then( url => this.url = url );

    }

    cancel() {

        console.log( 'URL is ' + this.url );
        window.open( this.url, '_self' );

    }

}