Why doesn't the anime start new seasons with new characters?

They've had HOW many episodes to develop this character and they can't even make him capture at least all the non legendary pokemon?

No as its not about capturing them all. His character has developed which can be seen in the current Sun/Moon series where especially during the rushed Lusamine arc all his 'friends' were overwhelmed by the whole legendary's and travelling to ultra space, mean while Ash was in his element as it was just another day for him and he had to bail several of his friends out of the trouble they got into.

All he does it get pity badges from gym leaders and explore areas

Okay you've clearly never watched beyond season 1 as he had earned every single badge since he started in the Orange Islands. He out right refuses to take pity badges now.

What ever happened to "gotta catch em all" or "I wanna be the very best"? He's accomplished NOTHING.

He is one of the best trainers outside of champions/elite 4 who are so far above league challengers that they have never lost on screen to anyone besides themselves.

/r/pokemon Thread Parent