Due to varying circumstances, myself and Mrs Octavius very rarely get out together on our own, perhaps twice a year or three at the most, so each outing is treated as a special occasion.
For starters I would suggest that you put a date in your calendar and aim to go somewhere different. A drink is fine, but not for the purposes of getting drunk. Maybe a nice meal or a movie and a trendy bar, something that you can both enjoy and laugh at, get your mojo back. Maybe dress up in your finest.
This night should be easy going and special - no pressure to be romantic, let it just happen - it should be something you both look forward to, aim to enjoy, and talk about during the months following when the daily grind starts to get you down again, whilst looking forward to and arranging the next 'special' occasion.