Doing long walks, watching new videos on YouTube and/or series on Netflix, do some workout at home (if gyms are closed in your country) - or meet up with your friends.
It overall depends on what you like doing in your free time, ahah
I tried to answer this subject yesterday but it seems it didn't work.
When I'm bored, I think about far strange countries, lost in time, space or other worlds, from fairy lands to glorious batle fields, imagining adventures of characters never known by any Earthling but me. And when I'm back in our reality, I take notes.
put some music, draw, read, do gym exercise, see a movie, write a story, call a friend, play videogame, stay in bed an think, dream and mamy more activities.