That's if you're rich and can afford trimix fills
Having a card that allows you to use helium doesn't mean you HAVE to use helium...
I got the card and used helium once or twice on dives to around 150'. I decided I couldn't tell enough difference to bother and quit using helium at all for dives around that depth or less.
Now I have the card to let me use as much helium as I want. And I generally do for anything deeper than 150'.
That is, until I finish my rEvo training....
Before embarking on any tech courses, I'd suggest either a gatekeeper course with GUE or UTD (fundies/essentials), or a workshop with an instructor who can teach such a course. Dealing with skills issues in a tech course is not the best use of that time, in my opinion.
TDI Intro to Tech also offers that same type of training. Again, provided you take it from the right instructor. Unfortunately (or fortunately, depending on how you look at it, I guess) the TDI standards for Intro to Tech do ALLOW it to be taught in such a way that it does not result in the same level of student preparedness as Fundies/Essentials.