Complete privacy in our daily lives or zero internet days with no one watching over us or listening or monitoring our regular behaviour can now be considered a luxury. Such an experience was only enjoyed by the generation born in the 80s. That was when photographs were treasures to be shared with the dear ones. A secret whispered in friends' ears often went to their graves. A sealed letter never required encryption, and travel to unknown places meant constant interaction with the locals for asking directions. We were social and interactive, and personal computers were "Personal".
Personal spaces existed before internet data collection invaded our homes. It is easy to install a firewall, protect the computer from potential hackers, and install home safety devices to protect it from trespassers, but it is nearly impossible to stop devices from tracking personal information. The latest privacy policies listed on every website, on average, take 20 minutes to read. All websites worldwide use cookies to store personal information on their servers, and they have an average lifetime of about 30 days, but cookies can also be set to last for over a year. Turning off these cookies is something that hardly anyone does. The websites dissuade it by giving pop warnings when disabled, or worse, make it a difficult process. Creating a digital footprint is only possible to exist in the present world.
Internet is now designed to be a data-consuming entity. All internet-enabled smart home devices, such as smartphones, mainly function 24*7. These are constantly listening to you, watching you and tracking your movement and choices. Digital cameras and AI algorithms can identify a face in a video or from a photograph and scan hours of camera footage. Moreover, a person can be identified through public cameras, such as traffic signals, mall
parking, ATMs, high-security buildings' entry and exit, lifts, airports, railway stations, etc. Nowadays, digital tracking is active on smartphones as a default setting for GPS-enabled phones. Even when data is switched off, GPS is actively tracking. The smartwatches can be compared with house arrest monitors, which constantly keep a watch on a person's movements.
The only solution to ensure your personal space remains "Personal" is switching off the digital devices and the internet when not in use. 
The WIFI at home should be closed when not required. The smart devices should not be like a family member whose presence needs to be constantly felt. It is important that we understand that few things should be kept outside the boundaries when building a safe, non-intrude-able space for ourselves. Digitally, we live in a space that seems free, but if we look at things at a deeper level, we live a life monitored by profit mongers constantly devising ways to sell, manipulate, and control our lives. "Switching off" is one small change that will bring immense peace of mind in the future that is constantly being encroached on by digitization.
References:
https://analyticsindiamag.com/shrinking-personal-space-in-the-online-world-data-privacy-concerns/