So you can't upgrade the antennas to help the signal.
Connect to More Devices Simultaneously With 8 x 8 MU-MIMO With traditional MU-MIMO, multiple users can access the router simultaneously without any noticeable decreases in bandwidth quality— up to a point.
Please visit and check: This router may not support all the mandatory features as ratified in Draft 3.
Increased Efficiency with OFDMA Make Latency A Thing of The Past The WiFi 6 standard uses OFDMA for increased efficiency.