What should I expect if I taper off/stop Rogaine after two years?

Rogaine is only effective as long as it is used. Unfortunately, any benefit gained from its use will disappear if you discontinue using it. I suggest a consultation with a restoration specialist who can examine you and discuss your possible treatment options.

CTE is unpredictable. If CTE is your “only” diagnosis, you might get a bit of shedding when you stop because that’s what CTE does. If it truly was helping alot you’ll get alot of shedding.  The key thing to keep in mind is that if you have developed androgenetic alopecia as well (or if it was never properly diagnosed) you’ll likely shed alor of hair when stopping.

Like any treatment or medication, if you stop using it, you lose the benefit.  Because Hair Loss is progressive, you would most likely to return to the rate of loss you were experiencing before you started the Rogaine) unless you've addressed every underlying issue).  If you've achieved the maximum result from Rogaine, you may want to consider adding another treatment to your regimen (e.g. Low-Level Laser therapy, PRP, etc.), but tapering off from something that has proven helpful may not be the way to go.