Welcome!
Positioning your speakers and listening position is the easiest/cheapest step. Keep away from front wall (at least 3ft). Ideally the listening position is symmetrical to the speakers, well removed from the back wall, and 5 - 10ft away from the speakers.
Secondly use a non-squarish room that isn't small. Ideally it'd be well insulated and dedicated to you and listening. Remove hard surfaces and anything bulky from between speakers (interferes with soundstage).
