Like someone else mentioned, sounds like maybe you need a hobby.

Personally, sounds like you are ready to upgrade. That's not a bad thing! Makes a big difference when you move to the Left Seat. What seems routine from the right seat doesn't seem so routine from the left seat.

Along those lines, are you getting ready for Upgrade, do you know your systems as well as you should, how about the FOM? Just saying, it's a great time to start really thinking about that stuff, makes upgrade that much easier, plus Captains appreciate the guys who are thinking too, makes their job easier, just do it in such a way that doesn't step on their toes.

In regards to the making it to the majors and it being different. Yes and No. Airlines are all basically the same, slight variations in business model and whether they are pax or cargo, but from a pilot perspective, they are all similar. (Just have different philosophies/ways in doing things. There is a lot of sit time. Domestically, your trips are similar, but I've found for some reason it seems more difficult and takes longer to get comfortable with a new airplane. I think of a lot of that is based upon not flying to the same destinations as often and the added challenges of more complex FMCs and trying to master VNAV/Profile or whatever Airbus calls it. (I'm not sure what your flying, so not a knock if you're flying a nice airplane). Internationally is a totally different type of flying. The Language differences,Country Rules and Regulations and Ocean Crossings offer a lot of challenge and more study than your average domestic trip. Plus you have the benefits of the more exotic layovers. (That being said, there are plenty of great things to see/do domestically with the help of a rented bicycle or cheap rent car.)

Many guys who get bored/don't like the routine of line flying, get into Management, the Company Safety Department, go to the School House, or do Union work. That's not unique to any airline, whether it's a Regional or Major (Pax or Cargo). At my airline, there are designated pilots who are 'Flight Test' and their entire job is to check airplanes coming out of Heavy Mx and are involved with any special projects involving the airplanes. They do very little line flying.

Point is, there is something for everyone, you just have to look around a little bit. Good luck!