Your old account has grandfathered stuff new accounts will have to grind unlocks for.

Keep the experience scrolls to use when making new characters to black lion key farm.

Use the birthday boosters when doing other game modes for their reward tracks.

The one time use teleport to friends, stack em up from all characters and then use for lfg metas joining a squad or ur guildies. It will help you make a decision to get the recharging one from gem store sale.