i must be getting old if death note counts as old anime :(
As usual, the truth is that anime is only getting better. For one aside from bleach is just a bad show, it also follows the "weak main character that eventually becomes the best" cliche and so does one piece. so i can tell you are just coming at this through nostalgia goggles.
Promised Neverland, Psycho pass, mob psycho, and AoT to name a few are super dope and definitely better than bleach or trigun. Right now we get more good anime than ever, also more bad than ever but thats just how the averages play out since we are getting more anime than ever in general.