increase tmobile home internet 5g

Thank you for the 400-500mbps. I'm in shock!!!! I got only .04 mbps upload and 5mbps download 98% of all tests. Once in a while (2%) I saw 10-22 mbps download and 3-5 mbps upload. The bars are always 3-4 which is good and very good. Then I moved it closer to the window and now it's 4 bars most of the time but the mbps still the same. I use cat5e ethernet cable. The computer is a gaming system. So then I thought I test the speed test with the cell phone using the wifi from the box and yes it has the exact same results. And when I disconnect the wifi and use the cell phone 5g it went to 200mbps download and 27 mbps upload. Just talked to tmobile customer care then they concluded its congestion and my box might not be working at all because when I shut off the power and they played on their end to get me to test it to 200 mbps it gave me the same result when I rebooted with 4 bars. And we did it 3 times. One time with the 1st lady and 2 times with the 2nd guy who is the technician. Hopefully the new box he ordered for me will fix it.