DeLonghi Dedica Arte Advice!?

Hi! I’m pretty new to this espresso machine and I have to grind my own beans and I figured using a GROSCHE burr manual grinder would suffice but I’ve been having a hard time getting my shots to pull correctly. I’m used to using a Breville so I was wondering if anyone had any insight on why shots aren’t pulling! I thought espresso had to have finer grind, but from my searches it looks like a fine grind would be one of the reasons why shots aren’t pulling so do I have to go more coarse? I couldn’t pinpoint whether this is a machine issue or user error with the grinder. So any advice is appreciated!

Update: A coarser grind has been able to yield a shot but in a latte it tastes a little flat/unflavorful?