Advisors and publishing - new field for postdoc
Your problem is not uncommon, especially in post-doc programmes. The level at which an advisor would dedicate his time to a post-doc fellow would vary widely among universities and countries. 

From the possible viewpoint of your advisor: as a qualified PhD, you are considered to have sufficient skills to do progressive research (even on a relatively new field) and frame a paper by yourself. Certain advisors merely proof check your work for their part. Some may do more than that and some even less. 

This is not always negative. Some may recall this a luxury. It gives one freedom to explore. Hence the way you look at this is subjective. 

Note that not all advisors come into the above category. There are dedicated advisors who provide substantial support for their postdoctoral fellows. It would be generally better to network students from prospective advisors to get a better idea of the support they provide before you enter another post-doc programme. Although it may not always ascertain that your situation may change.

If you believe you do require assistance for your new topic, the advisor is not your only hope; you could try to find a mentor who could provide you the domain support you need. If you could find another advisor to switch to who would suit your preferences (backed up by the networking as described), then you may make the move. The final choice is ultimately up to you.