Telus fiber not reaching the bedroom

[wireless]

Hi everyone. I live on thé ground floor of a 3 story townhouse, 1 bdrm 600 sqft.
I had fibre installed last year, the modem is by the door and my bedroom is in the back of the house with a small patio attached.
Next to the modem I can get around 600mbps, but in the bedroom 15-20ft away I’m getting around 150/200 max. And in the patio it sometimes even drops off!
The weird thing is that if I walk a block outside my door down the street, I would still be connected.
Can someone help? Is my option the extender? Because I don’t think I can move the modem to a more central part of the house.

Thanks for reading!

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