>>1665833100 for that bike was a really good deal, I havea previous model with steel for that I purchased for 400eur and it still was a really good price, the bike is really solid, that's why maybe you feel the upgrade is not worth, but it is.What I did was buying the Btwin ultra 700af that had a 25% discount, so for 750eur I got a real upgrade,the bike was smaller because I wanted something more racey, I got a bike with carbon fork and full shimano 105,internal cable routing, a compact crankset,better wheels and on top of that the frame was nice, and with that bike I really don't see any reason to upgrade, it has everything I need, only thing I don't like is that it has the rear brake next to the bottom bracket and I have to clean it pretty often because it gets dusty.
Now, the bad things of your bike,Microshift 8spd works pretty well but its not very smooth compared to shimano 105, you have 3spd more and the shifting is way nicer, you are not pulling levers, just some soft force is enough to change gears, and it has an average compact gears, so there is no tricky 3 ring that can make your chain slip but that's is some quality of life difference, there is no real difference between an average 11sp gear range and the one you have.The bartape on that bike is pretty bad, so it's something you can change and is cheap.Saddle and wheels are other upgrades you can get.
My poorfag opinion is that you don't need a really expensive bike as long as you get certain things such as 11spd from a good and known brand (shimano, campy, sram) and better wheels.If I had to buy a new bike because I had no one, then I think I would spend around 1k-1,3k eur, no more, at that range you have enough for something with all the nicer basics.
So if you want to upgrade you will notice difference, but that cheap beast is no joke, I know a guy that rode my model in many endurance races and did many tours, over 50k km with that cheap bike.
Pic of the guy doing a 1k mile ride on the btwin