What To Best Use My Skill Tickets On?

[Scribe Scales]

Hey, I've already got plenty of skill tickets on board, with two of them expiring later this month, and I was wondering what should I best use them on? The thing is I already used up some previous skill tickets to get some of the best skills out there in the past, and I can't help but feel most of the other ones are either garbage or just too broad at best for me to even bother with. Also, I feel it might be wise for me to save the SEVENS skills altogether in case I get the chance to have those tickets get converted into gems in the game later on, especially since I already got all of the SEVENS characters and most of their skills unlocked already. Any thoughts would be appreciated here.

[Scribe Scales]

Bumping this to say one of my tickets was used earlier to be used on the Master of Destiny skill since that was one skill I didn't have. If anyone else can suggest any good skills that I can use those tickets on for the Speed duelists in particular, it'd be very well appreciated.