David
I fly a widebody and whilst I still very much enjoy the travelling aspect of the job and getting out and doing and seeing new things when down route, I find the majority of my time in the seat is pretty mundane. Long periods of time sitting with low workload and simply monitoring in the cruise. It won't get better.
In order to tackle that, I recently got back into light aircraft flying again and it was a massive breath of fresh air. No automation and a endless list of rules and SOPs to worry about. I get the same buzz as I did hiring a light single when I was a PPL.
I lived to work when I was younger but now I work to live. Give yourself something new to focus on outside of flying. Learn a new language or a new skill or do something different which will be stimulating and rewarding. It could even lead to a new business opportunity.