Before commenting about how or why you personally don't like NN, that isn't the point of this post, nobody will force you into it, this is just for the purposes of improving current intended design.

Novice Network is a system designed with the intention of veteran players facilitating smooth integration into the game by new players through answering questions and providing a welcoming social environment in a shared channel accessible throughout a single world.

We've seen over time that there has been drama involving mentors of course, but overall, many players appreciate and enjoy the system and its social aspect has helped make the game feel more alive for most, and especially those not in an FC.

So the problem i'd like to address is the population cap.

Mentors - 100
Novices - 400

This is absurdly small, understandably for the purposes of making sure the chat isn't flooded at all times. However ultimately for the growth this game has seen I feel as though this is detrimental to the potential new player experience.

to put the above numbers in perspective, novice network was introduced in heavensward patch 3.2 - Source

the population at this time was roughly around 6-7 million concurrent players globally.
around 3 million on NA servers, 2 million in jp, 2 million in eu.
by world the average player count was about
170k in NA, 80k in jp, and 200k in eu.
Source

the novice/mentor limits were the same back then as they are now, and yes 8 years ago people were complaining about this pop cap too so in all honesty i don't expect very much traction.

However, the population has increased by about 4x, with 29 million concurrent players globally.
14 million on NA servers, 6 million on JP, 8 million in EU, and 300k in OCE.
by world average it becomes immediately apparent why the current novice limitations aren't sustainable:
NA - roughly 500k per world (0.1% have access to NN)
JP - roughly 170k per world (0.3%)
EU - roughly 400k per world (0.13%)
OCE - roughly 70k per world (0.7%)
Source

Solution - Create multiple channels for novice network.

With most new expansions we've seen zones be instanced into 3 for the relaxation of congestion experienced across each server, and as the population stabilized as players finished what they were interested in doing and unsubscribed for the remainder of the patch, the zone instances were removed or re-introduced as was necessary.

So just do this for novice network. Have separate channels exist during periods of high player activity, especially so during influxes of new players, retain the same mentor/novice limit per channel, and dissolve the extra channels to funnel people back into the single regular channel most people would be accustomed to during low traffic periods.