I already enabled incoming connection and tried to add the maxconnections command to the conf file but none of the procedures worked. Could it be a matter of bandwidth of my interernet connection?
It takes hours or days before someone's nodes start to connect to you and it depends on the router's firewall. It is likely the same as torrent it takes a while before you can see more connections. And take note maxconnection is only for inbounds not for outbound I don't know if there is a command to increase outbound.
And please read this
Bitcoin by default will not make more than 8 outgoing connections