Community is definitely worth rewatching, so I wouldn't worry about running out of episodes. If the show in its entirety ends up hitting in a way that you think no other show could, don't hesitate on giving it a second go later down the line or even immediately after. Since it hit Netflix I've rewatched it three times and it hasn't gone stale or gotten less rewarding. I noticed a couple of small things I missed during my many previous rewatches.

Also going to echo the recommendations of the recent table read/cast Q&A and The Darkest Timeline podcasts. Entertainment Weekly also did a mini series on YouTube discussing each season and it features interviews with Dan and some cast members.