It sounds like the Amex Plat does not present you with good (or any?) value given your natural travel and spending habits/preferences. Even the airport lounge access as you describe seems like negative value - you're talking about buying tickets solely to use the lounge; rather than buying tickets to actually go somewhere and having the lounge as an ancillary option.

Perhaps I'm missing something, but given everything you just posted - is there a reason you are continuing to hold and pay for this card? (I don't mean this in a snarky way; I'm just sitting here thinking that none of the items listed are particularly new so if I were in your shoes, I'd have cancelled the card a long time ago.)