I think people blow GTO up a little bit. Anyone who has done basic stuff like study ranges has studied some GTO, just not in very much depth.
GTO will not make you too predictable, its the opposite.....it balances calls folds, bets and 3 bets in spots where you usually wouldn't to keep your range balanced without understanding GTO. Also in the micros, who is going to notice this in reality
If playing the micros, you have to instantly deviate, as the population will call more often and so
bluffing at GTO levels/spots is a waste of time and will burn your money. You can probably get away with raising bigger on average too for value.
I haven't studied much GTO, but the small amount I have is great to have as a base, but I wouldn't be trying to play like this as a rule.....I think the best way to play is via a combo of what you have learned and what your gut/instinct is telling you.
But if you do want to improve your game over time, then studying more GTO is the way to go, but when you do, you have to understand the why behind what the solver is telling you, otherwise you won't actually understand what the point is, and whether/how to deviate at low levels games, against weak opponents