How to automatically connect to tethering on boot

Hi everyone,
I have a USB 4G modem that acts as tethering (it is not recognized as a modem, but as tethering).
When I reboot the router, however, I need to press “connect” every time to connect to tethering.
How can I make this automatic at boot?

I have tried my changing the metrics of /etc/config/mwan3 as follows, but it was unsuccessful.

config globals 'globals'
        option enabled '1'
        option mmx_mask '0x3F00'

config interface 'wan'
        option enabled '1'
        list track_ip '8.8.4.4'
        list track_ip '8.8.8.8'
        list track_ip '208.67.222.222'
        list track_ip '208.67.220.220'
        option family 'ipv4'
        option reliability '2'
        option count '1'
        option timeout '2'
        option interval '5'
        option down '3'
        option up '8'

config interface 'wwan'
        option enabled '1'
        list track_ip '8.8.4.4'
        list track_ip '8.8.8.8'
        list track_ip '208.67.222.222'
        list track_ip '208.67.220.220'
        option family 'ipv4'
        option reliability '2'
        option count '1'
        option timeout '2'
        option interval '5'
        option down '3'
        option up '8'

config interface 'tethering'
        option enabled '1'
        list track_ip '8.8.4.4'
        list track_ip '8.8.8.8'
        list track_ip '208.67.222.222'
        list track_ip '208.67.220.220'
        option family 'ipv4'
        option reliability '2'
        option count '1'
        option timeout '2'
        option interval '5'
        option down '3'
        option up '8'

config interface 'modem'
        option enabled '1'
        list track_ip '8.8.4.4'
        list track_ip '8.8.8.8'
        list track_ip '208.67.222.222'
        list track_ip '208.67.220.220'
        option family 'ipv4'
        option reliability '2'
        option count '1'
        option timeout '2'
        option interval '5'
        option down '3'
        option up '8'

config member 'wan_only'
        option interface 'wan'
        option metric '2'
        option weight '3'

config member 'wwan_only'
        option interface 'wwan'
        option metric '3'
        option weight '3'

config member 'tethering_only'
        option interface 'tethering'
        option metric '1'
        option weight '3'

config member 'modem_only'
        option interface 'modem'
        option metric '4'
        option weight '3'

config policy 'default_poli'
        list use_member 'wan_only'
        list use_member 'wwan_only'
        list use_member 'tethering_only'
        list use_member 'modem_only'
        option last_resort 'default'

config rule 'default_rule'
        option dest_ip '0.0.0.0/0'
        option use_policy 'default_poli'