Some thoughts for you, OP.
Try British agents first. A cover letter is easier to write adn British agents almost always read pages first. Louise Buckley is currently open to queries (she isn't usually) and so is Juliet Mushens. Other than that, if you need a list of British agents, let me know and I can pass along my Excel spreadsheet for you. That said--I did use my query letter for British agents this time around, because it was better than my elevator pitch.
Sociability doesn't have to be an issue. Was it you who said you're autistic, or was that another writer trying to move from self-pub? If not you, my apologies. Either way, I'm autistic and not a very good verbal communicator; I found The Call tough to do (especially since it had to be over Skype) and I may have actually needed a drink afterwards >.> But agents are used to reclusive writers and the one I was talking to is very familiar with people on the spectrum, so they were kind about it. I think most agents will not to be total douchebags about this kind of thing (they'd lose clients, otherwise).
Building off that, an agent can do a lot for you. Help you promote, contact people for you, be aggressive and organised for you, etc. Things that a reclusive writer type person finds tough. They are usually good if you can get them, though of course it's worth noting that bad agents exist, and bad agents are worse than none at all. Plus the odds, in general, are fairly brutal. Once you cut out the ones who really only take YA, who don't take epic fa, who are closed, etc., there are about 50 or 60 sff agents worth querying for epic fantasy. Rough estimate.
Subbing to small presses or even bigger ones can work but it is a long, slow toil. Subbing to somewhere like Tor likely means languishing for years in the "maybe" pile (assuming you make it out of the initial slush pit) because priority is given to agented authors. Edge are good, but epic fa will put you over their strict wordcount. Baen are active slush readers, but be prepared to wait 9 months to find out whether you've made first cut.
Pitchwars could be an event which helps you. In Pitchwars you try to attract a "mentor" (agented author or industry professional) who works with you on your MS, and helps you write a pitch/query to attract an agent. There's a special event at the end where mentors pitch their mentee's stuff to participating agent. There's also a fair amount of Pitchwar mentors this year so hopefully your odds would be better than the year I participated in.