A lot of people are willing to spend good money on monitoring but forget to work on the acoustics of their room.
Big, BIG mistake!
Yes, you should get good monitoring. But make sure your room stands up to it. Otherwise you’re just wasting the potential of your speakers.
Tightening up the acoustics will make a huge difference no matter whether producing, recording, mixing or mastering.
It is often said you should look at how much you spent on your monitor speakers and spend the same amount of money on acoustics. I think that is absolutely true.
That being said acoustics is more planning than anything and you can often get started (and achieve great results) with very little investment.
Especially when working with a home/bedroom type of environment.
If you want to learn more, here are a couple of brilliant resources. Pretty much all you ever need to know: