There is multiple reasons why this server or lineage 2 mid rate servers in general have been very lackluster in terms of random/daily pvp in the past couple years. On the previous sublimity (Exile 2014) we had the same issue already. Last sublimity server which had an active pvp community was Final back in 2012.
For one, lineage 2 has kind of evolved into a different game over the years. Nowadays big clans which make the main population of a server consist of constant parties who only ever log into the game for mass pvp events a couple hours per day or maybe not even on a daily basis. Most of them have been playing this game for so long, they are in their early to late 20s or even 30s and have responsibilities other than doing random stuff in a time consuming mmo game. They want to spend their ingame time as effective as possible, hence they bot/donate for gear and play the game the way they can get the most fun out of it in a limited timeframe, which is hanging with their friends (CP) in teamspeak attending mass pvp events at a set time. If it wasnt for their CPs, most of them wouldnt even play this game anymore because they only ever enjoy playing with them and nothing else.
Another point is that l2 isnt really the best game for random/solo pvp in general, its extremely gear dependent, classes are unbalanced often only revolving around spamming 2 or 3 buttons, everything is chance based (heavily determined by RNG, you get stunned/silenced/crit/whatever and simply die with no possible counterplay). In terms of pvp quality there are simply better game alternatives available today which are a lot more demanding and fair.
There is still random/small scale pvp in l2, but only on highrate pvp servers which were specifically designed for it, often revolving around specific pvp zones/events, kill rewards etc. Pve is completely eliminated or kept to a bare minimum so people dont have to deal with it.
The only possible way I could see increased pvp activity on a server like this would be with pvp events and a reward system designed around pvp. Sort of like the Blitz event on Exile 2014, but maybe with a bit more variety and on a more regular basis. Maybe even something that is avialble 24/7 so people can just log and have fun no matter when they decide to.
So is it really poorly designed server features? Both yes and no. Designing a server today, I think it needs a different kind of philisophy than back in the day. Even tho Terra and past sublimity servers very always innovative in a way, they still kind of followed a very oldschool mindset of "how an l2 midrate server has to look like". Players have changed over the years, the responsibility of a good server admin would be to adapt and make it more enjoyable for the currenty population of people. This is just about increasing daily pvp and general server activity, mass pvp doesnt need anything other than balancing changes because of what I explained above, plently of people are attending it.
Wall of text I know but I couldnt get/didnt want to do it any shorter.