Room and system synergy are the main items to work on. If you don’t have a good dedicated room that you can place your speakers say 10’ out into the room if you need to and it’s treated, don’t waste your money. If you have to place your speakers up against the walls and next to furniture because of the WAF, nothing will sound their best. Buy the appropriate speakers that fit your room, then buy the amp(s) that will make your speakers sound their best.
I have gone to dozens of audio shows (ces, rmaf, Tampa, northwest audio to name a few) and there have been probably 100+ rooms with hundreds of thousands of $$$$ of gear that sounded like sh$t mainly because the wrong setup for the room.
But I also think you build a system with the correct synergy with the room and all the system components, the more money you spend will get you better sq, until the difference in sq isn’t worth the much more $$$$ you will be spending to achieve it.