Ahhhhhhhh… So now I understand what your problem is. You think because you placed an alt account in Diamond, by managing to win most/all of your placements as well as the 5-7 successive games after, that your other account should automatically move up because you supposedly proved you can contend there…
Dude that’s not how it works for anyone. Overwatch is a grind. If you wanna climb higher than diamond I recommend you only play on that account. Otherwise you’re going to have to earn the SR like everybody else…
That’s the point of PBSR. That’s why the meme responses of (git gud and if you’re good you’ll climb) exist… PBSR will push you out of lower Elo if you genuinely deserve it. But you still have to put in the time to prove it.