Given the limitations (that you describe in other replies) I think you’ve got a good list.
Regarding podcasts, this could be a great time to experiment with new ones & decide which you want to listen to longer term.
Perhaps there are some short activities of value to you, such as Anki (assuming you have a smartphone), mentally reviewing your memory palace, or mindfulness exercises. Mindfulness exercises on public transport may seem a little odd, but the distractions may make it more effective as exercise—just be patient with yourself.
Trans-human thought experiment:
Scenario 1: A human brain is converted to a virtual brain through a destructive process (as described in many science-fiction stories). In what sense is this virtual intelligence the same “person” as the original, organic person?
Scenario 2: A human brain is converted to a virtual brain through a non-destructive process. The original, organic person lives on as before. In what sense is this virtual intelligence the same “person” as the original, organic person – is this the same as the answer in scenario 1?
Why this seems to matter: If a virtual version of me is not really me in the sense of being a continuation of my experience, then what does it matter to me if that virtual brain exists, as opposed to some other virtual brain? Is there actually any advantage to working out how to convert people en masse to virtual intelligences?
(I am aware that the questions of identity and “being a continuation of my experience” are vague but I anticipate that replies here will help me get clearer. )