I tend to agree with Blazzingpedals about the level of improvement that might be achieved by going from an already decent road bike to a new more expensive one.
Now if you were switching fundamentally different style bikes, That is much different. If I were to buy a Giant Content SL Disc road bike to compliment my 31 lb Giant Sedona comfort bike with its bolt upright seating position and cheap 2" semi knobby tires, There is no doubt in my mind there would be a big improvement in performance. Almost enough to cover a gap like you are describing.
That said, If a new bike inspires you to ride more, is more comfortable then what you have, or just makes you happy to ride, Then by all means go for it if it's not a financial burden. Another bike might very well make a small improvement in performance, Just don't expect the night and day improvement a good road bike would make over a comfort bike. Happy trails.
Last edited by xroadcharlie; 07-26-19 at 06:02 AM.