The norm is that you use it with the last date released card before your ticket expires.
Unfortunately, the trend is that the URs will now be crap rares with dependency on imbalanced skill, it is advisable to stick to Swirl Slime, Malefic Paradox Gear and Masked Hero Anki and Red-Eyes Slash Dragon and Cyber Harpie Slash
From experience, no way! find a UR that's in a seperate box from the other cards in the deck you want, this you only spend 5 million dollars instead of ten million
The teaching from "Not KoG" is false teaching. I, too, in the past waited a long time to use my dream ticket, until they almost expire, because I want to get newer cards.
But as it turns out, doing that was pointless. You can test it yourself if you have several dream tickets. The one that's about to expire (which means you got it long time ago), can only be exchanged with very old cards.
With the difference that often new meta decks need some key cards from old trash boxes. Not to mention that banlists can make your invested dream ticket a waste.
My advice, always go for staples, extra deck monsters or for core theme cards that are still relevant in tcg (stratos etc).
If you are a new player, use it as soon as you can to get a good deck fast for ranked. Otherwise, wait.
Anonymous
Not KoG
WoodFrJared
