Not sure how they could reduce it, right now it's 3 taps. Center icon at the bottom of the screen -> Accounts -> Account to switch to.

I guess maybe if they had the accounts listed at the top under a drop down or something? Would still be 2 taps, one on the menu, one for the account you want.

Also (I posted this feature request a couple of weeks ago) support for multiple accounts in a single timeline would be nice (like Liftoff! does)