Go to https://ngrok.com and sign up for a free account.
Then install Ngrok on your VPS:
wget https://bin.equinox.io/c/bNyj1YJU7r/ngrok-stable-linux-amd64.zip

unzip ngrok-stable-linux-amd64.zip

sudo mv ngrok /usr/local/bin

2. Connect Ngrok to Your Account

ngrok config add-authtoken YOUR_AUTHTOKEN

3. Run Your n8n Docker Container (HTTP)

ngrok http 5678