Without adding displacement or forced induction, there's only so much you can do.
I was considering various things, this whole time matter fact. One of the things I've had in mind is when the bike reaches 40k miles, rebuild the engine if needed, and start looking into a turbo system. Then I'd buy a newer engine with lower mileage, beef up the internals, and then put it in the Versys. Yes, I am aware it'll be very expensive and I may as well get a new bike, but it's a project I'm willing to work on. I'm also going to be buying a second bike, possibly a Grom.
There's several perks this would have for me: 1 More power. 2. The thrill of a "new" bike due to the power increase. 3. A more unique bike.
Yes I am aware of the downsides of a turbo, but when it comes to that, I'm not worried - I'll sort it all out.
I don't post that much here, but I'm in the process of having a very unique V-650. I'm sporting it out, which to some may be blasphemy for a dual sport / adv bike, but none-the-less, it's happening and coming well. (I can supply pictures after I clean/wax today. I'm a very proud owner though, I get several compliments whenever I go out, which is what's pushing me to just continue modding the bike.