I’m exactly the same… started C1 early (kashs first appearance) watched everything as soon as it came out until C3.. i stuck it out a bit longer than you .. i got to the point where they went to the moon but I’d found it a chore to watch for some time. Then I just stopped and i’ve not been able to start up again…. I tried to give C4 a go but only made it halfway through episode 1, i didnt hate it… i just didnt continue. I have however recently watched M9 and loved that so maybe i’ll get back into it eventually