More episodes about exploring, and less focused on the crew's own personal drama. Especially Data.
Don't get me wrong, I love Data, but the whole thing became 'The Data show' by the end, IMO. Thanks to his sub-plots, every other scientist now in ST has the last name Soong... and I am pretty sick of it. Its like the writers don't understand that not only is it extremely rare for the offspring of a brilliant scientist to also become a brilliant scientist, but for every one of them to have the same type of personality and even be super-famous for it? 'Scientist' isn't inherited, that only works for royalty, politicians, and entertainers.
In the original pilot, the security personnel DID have a separate insignia, which was later dropped for the show. There was also a separate 'away team' uniform (grey), which SNW has at least given a nod to (and I believe
Enterprise also may have done this at least once), and originally, every ship was supposed to have its own uniforms and insignia-badge (not the insignia itself - just the shape of the badge - only Enterprise was supposed to have that boomerang-looking one), but all of that was dropped to simplify things (but it does explain why we see so many different uniforms and insignia around - it was actually meant to be that way from the beginning). As for the now missing insignia for security - its the one that looks like a 'C' in this pic, and you can see it on the 'bridge guards' in
The Managerie.