How to force TCP window scaling using SSH?

Inter continent data transfer's speed is maximum 2MB/s. I checked and the SSH server of my server doesn't even use window scaling, and the window itself is very small, around 22KB...

Flags [S], seq 1433200120, win 29200, options [mss 1420,sackOK,TS val 1451891061 ecr 0,nop,wscale 7], length 0
Flags [S.], seq 3549718494, ack 1433200121, win 65535, options [mss 1460,sackOK,TS val 4214039974 ecr 1451891061,nop,wscale 9], length 0

Server is 65535*9=**590 KB** Window scaling is enabled.

$ cat /proc/sys/net/ipv4/tcp_window_scaling 
1

And I've already increase all the parameters to 25MB and 16MB minimum an default in /etc/sysctl.conf:

net.core.wmem_max=25165824
net.core.rmem_max=25165824
net.ipv4.tcp_rmem = 16777216 16777216 25165824
net.ipv4.tcp_wmem = 16777216 16777216 25165824

I'm using Fedora 39 and RHEL 8, what can I do to force the SSH server to handle much more inflight data?