Clash, your home block is a town plot, so if your home block was not on town land you technically would have no town left. To answer your question, you can claim a chunk as town land, move your home block to that new
Plot and delete the rest of your town plots. Just to warn you though, everything in your town plots that you unclaimed will delete itself including chests and all the items inside. I think the command to change your home is /town set home.