How much does a factory reset help in hiding a device's identification details?

I got banned from a couple of websites like Reddit, and my idea is to use a VPN to hide my IP and then factory reset my Android device so that the website can't recognise the device. After looking online, there seem to be mixed opinions about whether factory resetting a device actually makes it look like a new device. When you factory reset, does the MAC address or the serial number of the device change? And otherwise, are websites able to detect this information anyway? I guess a website can still see details of the device such as the OS it's using and its hardware specs, in any case, so even with a factory reset they'd still be able to see that particular information, wouldn't they?