If your museum is a registered charity or a CIC you can have a free ‘Power Hour’ from Cause4.
This Power Hour can be focused on a range of areas including income generation, fundraising strategy, or governance challenges.
Cause4 is a non-profit organisation supported by the Arts Council, and SHARE Museums East has worked with them on a few projects now around fundraising and income generation.
If you sign up for one of these do let me know how it goes! https://www.cause4.co.uk/free-power-hour