It's been a year or more since I've been partying in Belfast, The Harp Bar (part of the Duke of York bars as mentioned above) is a really lively bar with live music and always had a buzzing crowd, there are a good number of bars in that area that are all good.
https://dukeofyorkbelfast.com/venues/harp-bar/
A few years ago night out in Belfast for me wouldn't be complete without visiting -
https://www.revoluciondecuba.com/bar/belfast/
It used to be a very busy friendly lively bar, I think it still is.
Go to the Harp Bar, come back on here and tell us how your conquest evolved.
As Amor said stay in the city centre- no further north of the Duke of york bars, no further west than Robinson's Bar and you'll avoid any Belfast tribal issues