Keep your eyes closest on THAT one, changing it won't cost you anything. If there's another you have an interest in then sure keep an eye on that too, but it'll cost ya. I'm always surprised when people are on LH in the first place since it costs so much, but don't start adding change fees on top of that. LH opens J/F space close in to the fly date IIRC. What I suggest is maybe sign up for Expertflyer and set up an alert, or remind yourself to check every day. It's worth it in the end. The MUC-ATH if it opens, cool, if not, who cares, it's only gonna be Euro-biz anyway. I just booked a totally J trip minus WAW-IEV. The only reason I even care to bump it up is to make the whole trip J, though I know the J for that flight will be pointless.