You do not need to buy any more equipment. You already have very good equipment. You just need to learn how to use it and not glorify in, and advertise your ignorance on a public forum.
Lets look at the facts.
You have invested in a very nice set of speakers and very high quality receiver with superior amplification.
Apparently you want to stay ignorant with a disdain for learning.
Now let me tell you, you have complex equipment and you need to educate yourself about it without wasting forum members time
Correcting this begins with reading your manuals cover to cover and enough times so you really understand it.
Now your
Rotel receiver will deliver 198 watts at 0.1% THD into four ohms. So that is what they will deliver to your speakers.
I strongly suspect your receiver is not properly set up, especially the speaker settings.
You need to go through your set up process from the beginning.
If there are points you are not clear about during the set up post back.
The last thing you need right now is more equipment.