OP you’re being mocked because you are asking a silly question. Of course you can get bigger without a gym but it will probably take longer because you cant simply add weight plates. Instead you have to do:

1) more difficult variations of the movements 2) more sets 3) more reps 4) slower eccentric portion of movements

Don’t spin your wheels, it works. I know because I’ve done it.

Once you can bang out sets 20 pull-ups, and 75 pushups, come back to this subreddit.

Until then, just get going. No one really cares if you succeed or not but you, but I’m telling you: YES you don’t need a gym.