i have exactly that issue in my current room , there's a huge boost around 130hz (i think in part due to the big desk i have) , and there's some dips below 100hz , i ended up using REW and using EQ to fix that issue , it's a small cube style room with windows as well which doesn't help,
i always leave the door open too, otherwise that build up is even worse
i also mix/produce retrowave style electronic music, so adding a bit of room treatment definitely helped as well, but the huge resonance from the desk, is still the main issue, which is what EQ is correcting for , i'd say it definitely helps in dialing in tones for playing out live etc..
and it also makes a really nice bit of difference to the overall listening experience of music etc..in said room
if money is a concern, REW software is free, you can buy a measuring mic for under 50 euros (i use a Behringer ECM8000) just need a stand to go with it, and then you can apply EQ via your DAW and if you like with EQO for system wide
Julian Krause made a really good video on how to do it, in case anyone is interested