If you are mixing in your headphones(hope they are decent headphones) I suggest you use a freq analyser.
But actually the best thing you can do is make your room comfortable for mixing/producing. It sounds better! It's just more fun, you become more creative! And always take a break after an hour or so cause your ears need that and you'll get better perspective about the track.
A year ago I posted a link where you can add your room measurements and it calculated the flaws in your room. I'm speaking about your standing waves.
Gonna have to look for it, if I find it I'll post it.
Here are a few other tips...
If in a square room, do not place your speakers in the corner.(It adds more bass than there actually is)
Use a specific stand for it cause when you put them on a table, you again are adding more bass than there actually is.
Create a sweet spot.

Add two diffusers or a glass frame with a picture of you in L & R next to you where you sit.
Use some absorbers in the back and corners. A curtain will do, or you can buy some cheap basstraps .
you hear a whole different world

If you are a bit serious about producing/mixing, take my advice.
I look for the other link (standing waves)
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