I need a new hobby

bonsai trees

popcycle stick sculptures

smoke marijuana

cooking

puzzles

I write. You're an articulate guy. Ever think of writing fiction?

I've got musical instruments to keep me busy. Ever think of taking piano lessons? Electronic keyboards make it possible to practice with headphones and you don't need to dedicate a whole room to a piano.

Chess.

I have killed a Bonsai Tree, I think I overwatered it.
popcycle sticks... I did that in Cub Scouts I believe.
I have taken up smoking marijuana in small bits here and there. Mostly for pain relief and help sleeping.
Cooking... While I enjoy cooking, I do not believe it would replace the time I spend on the computer.
puzzles. So far, this has actual interest. I like this idea.
I think writing would would be too close to computer time. I have interesting ideas for topics but they never seem to coalesce into anything substantial.
I play guitar, but all three just mock me from their stands daring me to try to play again.
Chess - I played a lot of chess in high school which culminated in my eventual victory over my mentor.

So far, puzzles is the leading replacement.

That's a puzzling reply.

never tried 'em myself, but lots of people seem to enjoy audio books...

Somebody was bound to say it.

Brewing wine and beer is quite easy, especially wine. You don't need much equipment to start off with and you can have fun with strange recipes.

Dandelion wine is very good.

My mate plays a lot of chess on redhotpawn.com

- There are a number of phone games that are fun and require significant strategy. Empires and Puzzles comes to mind.
- If you don't like reading with glasses but enjoy reading in general, get a tablet and raise the font size to your comfort level.
- As someone else mentioned, there are online chess and card game forums where you play people from around the world.
- Now would be the time to get back into TV. The content online is more varied than ever. Start with a series like GLOW (available on Netflix) or The Mandalorian (Disney). Entire seasons of cutting edge series are available and reviews are online to help you find ones worth your time.
- There has been a proliferation of puzzles, especially from Japan. Try KenKen or Nonagrams if you want something different than crosswords or Sudoku.

And you could do all sorts of puzzles - the traditional jigsaw puzzle. And within that there are all sorts - as complicated as you want.

Also - you have word puzzles, number puzzles - you can do on paper or on the computer (seems you want to get away from that) - the good thing about puzzles is that there is such a variety that you can go from one to a different type once you get bored of it.

Another thing on the lines of puzzles - solitaire - there is a variety of solitaire games - if you have others you can play a variety of card games - you can even go to your local target or walmart and try a new board game or card game.

Do you like art at all - sketch, even color - there are adult coloring books - not saying naked (although I bet there are some) coloring books but ones that are geared toward adults.

And if those don't work you could always raise "sea monkeys"

You could see a lot more top comedy. Bet you've not seen this.

Crossword puzzles.
Philately (stamping. stamp collecting)
Start a blog where you give your opinions

Your profile mentions "floundering in a pit of dispair" (sic).

Perhaps an online course in the humanities might severally serve some sense.

Body painting

Oh. And belly dancing.

audiobooks is really good to kill some time and in addition, you will learn a lot.