Controlling arduino with rpi3 over the web

Projects General Guidance
1

Hi everyone. I have a smart composting bin using sensors, arduino, rpi3, a motor, air pump, fan and a heater. The sensors are connected to the arduino and is then connected to rpi3 using a serial cable to serve as a database. The data is then uploaded to mariadb/mysql and I currently have a local web interface that displays the data from the sensors. I also integrated flask to control some of the components on and off such as the motor, air pump, fan, and heater. All of these work locally. Now for the questions. Would it be possible to host the web interface over the web while all of the functions are still intact? I basically just want to control everything wherever I am, not just locally. Such as having the data uploaded and reflecting on the web interface real time and being able to toggle on or off some of the components such as the motor or pump. I also want it to be free as much as possible. And if it's possible, how?

PS. I don't know if this heIps but I currently have googiehost and heliohost as a web host. Thank you.

2

that means you need to access your local home network from the Internet.
it's possible if you poke a hole into your firewall to allow incoming requests to reach your web server (and handle the probably changing WAN IP address of your home network with some sort of dynamic DNS solution)
of course, this comes with security risks.