I really like the crossbows but I'm getting bored with the two designs.
I would really like to more crossbow types, anyone else feel the same

To answer the title, nope.

There won't be any more crossbows, unfortunately.

It would be nice but I wouldn't count on it.

On Nexus there's loads and loads. I myself have a Dragonbone crossbow, the team's just got a new heavy Dragonbone crossbow, and we've recently retrieved the plans to several automatic Dwemer crossbows!