One of the recommended actions to avoid this isolation is to regularly prepare meetings in which you can see the faces of the rest of the staff, even if it is only 30 minutes a week and through a virtual café.
If possible, it would also be very interesting to be able to have physical and face-to-face meetings with colleagues, although this involves travel and expense, it is important to assume it to prevent loneliness for people who telework.
Another interesting formula is to contact and get to know the rest of the people who work in the same company, even if they do not do so in the same department. You can set goals such as contacting three workers each month, or looking for mentors, who physically work in the company, and can inform those who telework about what is happening in the offices.
It is also very important to maintain fluid communication with the company's bosses and managers, to be able to communicate how the work is evolving, or interests such as being able to be promoted, or receive a better salary.
Although it may not seem like it, and according to data from the website "monster.com", 54% of workers do it remotely, so it is very important to take all these aspects into account.