Good news! It looks like there is a bus available to take you down to Strawberry Field (pun intended)
If you’ve never been to Liverpool, Strawberry Field is in the suburbs and not near Liverpool city centre.
So, it looks like you now have two options. If you just want a selfie by the gate, then the Magical Mystery Tour will stop at Strawberry Field, but you won’t be able to go inside as it’s not a hop on hop off bus.
If you want to tour Strawberry Field, then you’d take their new bus which leaves from the Jury Inn on Albert Dock. https://www.wtm360.co.uk/sales/strawberry-field-1548854726
The Liverpool local bus system could also get you there, but it’s pretty confusing.
I’ve been to Liverpool 7 times, but now it looks like I’ve got a reason to go back! Strawberry Field just reopened and is now accessible to the public.