Blood Blockade Battlefront/ Kekkai Sensen anime has fans still wondering about a season 3 as you see below in the link. But the thing is while some are saying no I am here to tell you the answer is maybe.
Let me explain. The link reason as to why we are not getting a season 3 because season 2 ended where the original manga ended. There is one issue with that idea. The issue is season 2 was made of chapter from both series. Proof comes with the 1st episode of the new season actually come from Back2Back 1st chapter.
Back 2 back is the 2nd manga series and it is still going. Meaning we can still have that next season. The only thing is we need is an anime studio to bring it to life since we do have material to animate with. But we will just have to see.

Reddit:Kekkai Sensen (reddit.com)
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