Boost WIFI I need HELP! please

Hi so when i first switched to Telus i got a telus boost wifi system with it and everything was fine for 2 months. All of a sudden next morning i am getting really bad speeds. I have tried literally everything i was on technical support for a solid hour 30 and nothing. I tried solving it on my own as i am pretty tech savy and know a lot about networking but i cannot pin point the exact cause of this. I have a starter pack and 1 expansion. Both of the wireless points are under -60db. I have internet 300/300. I do a speed test on both my wireless boosters and i am getting 120down and 12up. I have actually no clue what to do and i don't want to upgrade my internet plan to gigabit cause that is unnecessary. I am to the point were i am about to throw my boost WiFi system and go get googles mesh. Like if anyone has any clue please help!!. I have been in my control panel for my router so much i can do a full 100 question test and get it right. i have spent over 150 hours trying to get this fixed and just can't.