A need for “Me” Time with no commitments: The number of people that are deciding to stay single and/or shift to work remotely has been increasing. They don´t want to wait for others or look for the right companion, postponing their wishes. 
When travelling, they don´t want to negotiate with someone whom they don’t think will be a good travel buddy 
In addition, pandemic has also meant an overdose of family time for many of them.
 

A search for a new tribe: Traveling solo, most of the time, means doing it in small groups, probably of like-minded people. 
There are big chances that they have chosen a destination or an activity for the same reason. This is the kind of new people a solo traveller wants to know.
They look to socialize in an environment where they feel safe.
In addition, solo travellers are willing to stay extended periods of time in a destination, in order to know the locals better and to learn their culture.
 

Organized adventures as the new freedom: Solo travellers want to feel free, independent, and in control of their own time, without the worry of the logistics of a trip. They are also aware that some adventures are only available on organized tours.  But it is always about living experiences for the first time again.
They look to feel themselves, once again, after childhood.
Luxury means backpacking during the day but sleeping comfortably at night.