I won't be popular for saying this but I say follow your heart. Motorcycling is a passion, not a job. If you are irked by a characteristic of the bike you have now (e.g. the sound) and can wing the insurance for a CBR650R and are comfortable on it, I say go for it.
Of course only you can judge whether you'd get into trouble on one. I4 engines tend to have relatively soft bottom end power delivery so you should be easily able to "work" up to its power peak up at 11,000rpm without much fear. The 2019s make about 80hp at the wheel, plenty for the street but without pulling your arms out of their sockets or risking a throttle-on loop. And the 650R is a **** fine looking bike.
I was in the same boat as you back in 2014. I really loved my 500 but the sound just didn't resonate (pun not intended) with me. I ended up trading it toward a Yamaha FZ8S and enjoyed that immensely.
2014 Honda CBR500RA (sold)
2011 Yamaha FZS800 (sold)
2017 Aprilia Tuono V4 1100 Factory