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Gracias. 

For 5G:

• RSRQ - a metric for the gateway’s received signal quality - ideal values are -10 or less (yours is -6 - Good!)
• RSRP - a metric of signal strength go your gateway (from the cell tower) - idea -80 of less (yours is 103 - not good, as if you are on the edge of your cell tower signal)
• SINR - a metric to signal to noise interference (other signals your gateway picks up that interferes with your 5G signal) - ideal values are 20 or higher (yours is 4 - poor).

For perspective - mine are RSRQ - 12, RSRP -77, SINR 14 and my download/upload speeds are just fine. 

From your metrics, we can conclude - 1) your signal strength is poor, so you will not be able to achieve good download/uploads. 2) your SINR shows that you have competing signals (LTE, other 5G, etc.) that your gateway is trying to sort out, which is reducing your signal efficiency. 

Recommendations - I would open the T-Mobile app and go to the 5G metrics and then think about the placement of your gateway. There are two different positions to consider; 1) location in proximity to your cell tower, and 2) gateway antennas. Generally the Arcadyan and Sagemcom gateway antennas for 5G are located at the 4 corners. So, plan on 30 minutes and start the moving process - after locating the gateway in the position that gives you the highest number of bars on the display, then start (slowly) rotating the gateway in a circle, ¼ or 1/8 turn at a time, trying to see increase your RSRP to something in the area of -80. You may need to leave the gateway in the position for 2-3 minutes. You can refresh the page/signal by swiping down after each test. 

Let us know how it turns out.