As others have said, the Actions menu has a shortcut to saved posts, whether you make it part of your bottom bar or Floating Action Button.
Another neat trick is that long-pressing the Action menu will automatically shortcut to whatever the first action listed is. So if you rearrange it so that Saved posts is the first action, your saved posts will always be 1 long-press away!
How are you accessing your Action menu? I think the 2 ways I have enabled are the bottom bar and the FAB. There may be a way to have it on the pull-out side menu, if you have that enabled.
If you don't have Saved as an option, you can hit the 3-dot menu on the top right of the Action menu, and select Action visibility to customize what's in the Action menu, and you can re-sort those actions so that your preferred action is accessible via long-press.
I have the action menu at the bottom, and with the side pane for navigation. I don't have the buttons at the bottom like you've got. I didn't enable that.