Using Bootstrap and DHT random walk does not discover more peers. What am I doing wrong?

I am really trying to wrap my head around the discovery mechanism in Libp2p. I am trying to combine Bootstrap and having DHT random work to dynamically discover and connect to peers. But it seems I am not getting it wrong or it is not just possible.

The code I am using is:

const Libp2p = require("libp2p")
const Tcp = require('libp2p-tcp')
const { NOISE } = require('libp2p-noise')
const MPLEX = require('libp2p-mplex')
const Bootstrap = require('libp2p-bootstrap')
const KadDHT = require('libp2p-kad-dht')


async function main() {
 
const bootstrapers = const bootstrapers = [
    '/dnsaddr/sjc-1.bootstrap.libp2p.io/tcp/4001/ipfs/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN',
    '/ip4/104.131.131.82/tcp/4001/p2p/QmaCpDMGvV2BGHeYERUEnRQAwe3N8SzbUtfsmvsqQLuvuJ',
    '/dnsaddr/bootstrap.libp2p.io/p2p/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN',
    '/dnsaddr/bootstrap.libp2p.io/p2p/QmbLHAnMoJPWSCR5Zhtx6BHJX9KiKNN6tpvbUcqanj75Nb',
    '/dnsaddr/bootstrap.libp2p.io/p2p/QmZa1sAxajnQjVM8WjWXoMbmPd7NsWhfKsPkErzpm9wGkp',
    '/dnsaddr/bootstrap.libp2p.io/p2p/QmQCU2EcMqAqQPR2i9bChDtGNJchTbq5TbXJJ16u19uLTa',
    '/dnsaddr/bootstrap.libp2p.io/p2p/QmcZf59bWwK5XFi76CZX8cbJ4BhTzzA3gU1ZjYZcYW3dwt'
  ]

const node = await Libp2p.create({
  modules: {
      transport: [Tcp],
      connEncryption: [NOISE],
      streamMuxer: [MPLEX],
      peerDiscovery: [ Bootstrap ],
      dht: KadDHT
  },
  addresses: {
      listen: [
          '/ip4/0.0.0.0/tcp/7770',
      ]
  },
  config: {
    peerDiscovery: {
      autoDial: true,
      bootstrap: {
        interval: 60e3,
        enabled: true,
        list: bootstrapers
      }
    },
    dht: {
      enabled: true,
      randomWalk: {
        enabled: true
      }
    }
  }

})
await node.start()

node.multiaddrs.forEach(addr => {
  console.log(`listening on addresses: ${addr.toString()}/p2p/${node.peerId.toB58String()}`)
})
 
node.on('peer:discovery', (peer) => {
  console.log(`Discovered ${peer}`)
})

node.connectionManager.on('peer:connect', (connection) => {
   console.log(`Connection established ${connection.remotePeer.toB58String()}`)
})

setInterval(() => {
  console.log("size of peers", node.peerStore.peers.size)


}, 5000);

  
}
main()

When I run this code, I see I connect to the peers listed under bootstrap and nothing more. I was expecting with the DHT random walk condfiured, this will lead to more peers being discovered. But this does not seem to be happening. What could I be doing wrong?