Thinking of selling my blk magic drainpipe, what lens should I replace it with?

Hi Y'all

Noob here, first time poster, long time follower.... I have a 40D and shoot primarily landscape, mainly sunrises and sunsets.... West Texas is FLAT.... Currently, I have a 18-55MM f/3.5 & 24-135MM Std stock stuff... My drainpipe is from my 1D days 15 years ago and is in pristine condition Any insights ? Any Trades offered?