Does the skill rating even change?

So, to preface this, i am by no means an amazing player, i am at most above average on a good day, so its not like i'm expecting to have some pred level skill rating or something.

But here goes. In season 25, there was added the season start reset based on the (hidden) skill rating, i got reset to bronze 1, no complains there, we had no frame of reference, thats just where i was starting.

in season 25 i did solo queue into plat 4, and duo-ed into diamond 4, which i think is decent performance

in season 26 i got reset based on my skill rating, again into bronze 1

what i dont get is how is it possible to climb to diamond without the skill rating increasing one bit, this honestly feels furstrating and demotivating that all my ladder progress is not aknowledged by the system one bit...