Tarian

I've updated to 1.17.2 but there are still a lot of issues for me. Mainly that I cannot play the game for more than 30 minutes before it refuses to load any more chunks and respond to me. Even when I log out and log back in, nothing changes, and I simply cannot play. I really miss this game and would like to get my world back on 1.16.5 until 1.17 is...'stabler'? Anyone know how to do this?? Thanks in advance!