From reading the Rel Por Discord chat, and to a lesser extent the Rel Por forums, you'd think that the shard was struggling - all you see is complaints. In reality, it's the same old story with UO. The silent majority enjoys the game and plays, the vocal minority poisons the narrative and puts off prospective players. Unfortunately the majority of these tend to come from the community I've usually been a part of - PvPers.
Just a bit of advice for you from someone that is enjoying Rel Por immensely; Having fun is down to you. I was a PvPer almost exclusively from roughly a year after I started playing (1998) until I quit OSI for the last time in 2007. Any time I've started up on a free shard, I've done it with the intention of getting into PvP - IPY, IPY2, UOSA. Learning from my mistakes on those shards where I burned out very quickly, my friends and I have decided on a different approach this time.
We're enjoying UO as a whole. For years, we PvP'd exclusively. PvE bored me to tears. I'd always rather be PvPing. I'd never had a crafter, only dabbled in things like treasure maps. We remember how much we loved UO, and a lot of the magic of the game came well before we were PvPers.
We've decided that here we're going to recapture that magic, and we want to be a part of helping the shard succeed and encouraging other players to engage fully again as well. I'm having the most fun I've had in UO since 1999, doing things I used to have contempt for. I'm looking forward to doing treasure maps, and placing our guild tower. Even GM'ing Magery.
For those of you complaining about a lack of PvP opponents - the developers can't fix it for you on their own. Whilst constructive feedback is obviously a good thing, constantly whining for changes fixes nothing, and drives people away - achieving the opposite of what you want.
Help the developers, understand it's not their primary employment - it's just a hobby for them like it is for us. In the meantime, go out and enjoy the game. Do something you haven't done before. If you've done it all, start a guild to help new players. Build a guild town. Make a hardcore PvE guild and get impossibly rich. Get out and advertise the server everywhere you can. ANYTHING would be better than what you're currently doing. You're not enjoying it, the other players aren't enjoying it. Prospective players aren't enjoying it, and the developers definitely aren't enjoying it.
We can all play a role in making Rel Por a success. Don't expect it to be done for you. Remember the developers are the ones paying for this, not you. Don't like the above options? Go do something else.