Hi Tosin,
Thank you for asking.

For 2,4

/**
 * For logged in user, Redirect to activity if trying to access home page
 */
function buddydev_redirect_tot_activity_for_loggedin() {
	if ( ! is_user_logged_in() ) {
		return;
	}
	if ( is_front_page() ) {
		bp_core_redirect( bp_get_activity_directory_permalink() );
	}
}

add_action( 'bp_template_redirect', 'buddydev_redirect_tot_activity_for_loggedin' );

1.- Depending on your setup, you may or may not need it. I am not putting any code for it as from previous posts by you, I am aware you have other redirects setup.

4. Use any existing plugin for it. It is 4-5 line of code but I am trying to avoid causing conflict with your existing setup.

Regards
Brajesh

Thank you.
Here we go
https://buddydev.com/inject-content-into-buddypress-activity-stream-after-a-certain-number-of-activities/

Best regards
Brajesh

Hi Propertytips,
Thank you for the patience.

Please upgrade to 1.0.8
Also, make sure to clear browser cache.
This should fix it.

https://buddydev.com/plugins/buddypress-group-tabs-creator-pro/

Regards
Brajesh

Hi Tosin,
I am sorry but I won’t be able to invest time in assisting with 3rd party plugins(other than BuddyPress) in our free support forums.

My suggestion will be to ask in the forums of BP Follow plugin.

Regards
Brajesh

Thank you.

Please allow me to assist you with it a bit late today.

Thank you
Brajesh