Physical forms of publicity and marketing - such as book tours, festivals, conferences, author signings and readings in bookshops - are possibly not going to return for a very long time, even years (and people could remain scared of close contact and gathering with strangers for longer).
I am still months away from submitting but I wonder if there is, generally, any ideas floating around about how a need to substitute the above for different forms of promotion might affect the process from querying through submission to distribution and sales?Specifically, how might such future differences affect submissions that need to address marketing, such as non-fiction proposals?
Back to basics: word of mouth.
Have a robust mailing list.
Have a significant social media presence.
Now, as before, most books are purchased after hearing about it from a friend.
Make sure you have a lot of friends.
Bookstores are doing a lot of virtual events, that certainly will help, but nothing takes the place of a 3000 name mailing list.