It is possible to forward traffic from the wired interface (eth0?) to the usb0 interface. Because you do not have provided any details about your network configuration I can only guess. You have to enable ip forwarding. There are several ways to do it: within /etc/sysctl.conf or by systemd-networkd or with /proc/sys/net/ipv4/ip_forward. Because you have ...
From the hostapd.conf file :
# Maximum number of stations allowed in station table. New stations will be
# rejected after the station table is full. IEEE 802.11 has a limit of 2007
# different association IDs, so this number should not be larger than that.
# (default: 2007)