This piece for Malachain collects the advice that holds up in practice.
Good sound at home depends more on where things sit than on what they cost. A pair of second-hand bookshelf speakers on stands, away from the wall and pointed slightly towards the listening seat, will embarrass an expensive soundbar. Add a small amplifier with a built-in streamer or a used receiver and you have a system that lasts decades.
Spend the saved money on the room: a rug on a hard floor, curtains and a bookshelf tame the echoes that muddle detail. Sit so that the speakers and your head form a triangle. Then put on a familiar album at a moderate volume and simply listen for an hour; the point of the setup is to make that hour something you want to repeat.
There is more to learn on this subject, and the linked website goes into greater depth. Treat this article as an introduction rather than the final word, and check any important decision against up-to-date, reliable sources before relying on it.
If you try any of these ideas, start small and adjust them to your own situation. What works for one person will not suit everyone, and it is fine to keep only the parts that help. Writing down what you changed, and what happened, makes it much easier to see after a few weeks whether the effort was worthwhile.
The most useful step is usually the first one. Pick a single suggestion, try it for a couple of weeks, and then decide whether it is worth keeping. Small, steady improvements last longer than ambitious plans that are hard to maintain once everyday life gets busy again.