How to Fix Misaligned Tooth from Not Wearing Retainers?

One of the great things with Invisalign is that if used as a "second time around" tool, it doesn't take much to get back to where things were. Certainly brackets and wires can do it, but if it were me, I would opt for Invisalign.
However, this is similar to wearing retainers, and since your first go-round with retainers wasn't very positive, you should think twice. If you know that you won't comply with wearing the aligners, then wires should be done. But even with THAT, you will need retainers at the end.

Invisalign or braces are recommended for a short time to retreat relapsed teeth,however after your treatment a fixed permanent retainer is recommended so your teeth do not shift again.

Rose, thank you for your question. A lot of people are in the same position like you.
A good news there is a very simple and fairly quick solution for your problem. Invisalign WILL make your teeth straighter,and in cases like yours, in less then a year.
Would highly recommend that treatment option.

It is true.  Minor relapse can sometimes be easily fixed.  That depends of course upon the stability of the rest of your bite.  If the back teeth are still hitting well and are stable when you bite down, then the minor shift in the front teeth can sometimes be quickly and easily corrected by mildly shaving the contact between the teeth that are crowding. Then the orthodontist would use what is called an invisible retainer (like Invisalign) with the problem tooth/teeth moved into the correct position.  Wearing this could correct the problem in a few weeks.  I hope this helps.