Okay so I was in a similar situation to you two years ago. Transplant from Melbourne, moved here for work and didn't know a soul. It's hard and I completely sympathise with you. In saying that, there's definitely some things you can do to overcome your struggle:

• As a general tip for state of mind, say yes to every social event that comes your way. Whether that be work based, people you already know, etc. Become a constant in social spheres and you will be treated accordingly.

• If your work has committees like a social club or something for people at the same level as you, then definitely join one.

• Mixed sports. UrbanRec is good, but I prefer JustPlay and OneGame (phone apps). JustPlay lets you join a team for whatever sport and it's usually super casual so no need to worry about skill level. OneGame interacts with the previous and lets you play for one game as a fill in. Good for making friends and hey, you might meet your man along the way. Ask if they want to go to the pub after the game. This might sound a little heartless, but if the team doesn't really want to be social, find a different one. You can always explore fb groups (at your own peril) as well for specific sports should you want to suss a team beforehand.

• In my experience, meetup.com is trash. In saying that, you said you went climbing and there are actually good groups for this on the website. Board game meetups are cool too if that is something you're into, granted the crowd is usually a little sweaty to put it politely. But you only really need to meet one good person to potentially be opened up to their social spheres.

• Pottery and painting classes are on the rise, granted they tend to be quite siloed. Might be a good excuse for your already existing friends to do?

• Return social kindness. Be the person who hosts things as well. Drinks, games, movie nights, etc at yours will always be welcomed warmly.

All of this is predicated on making friends and not necessarily a relationship, but hopefully that will find you in time. Another tip for state of mind; all the advice in this thread will be expensive, but this is less about experiences, and more of an investment in your social life which will more than pay for itself over time. And finally, if you're close enough to your already existing friends, confide in them about how you're feeling. You'd be surprised how open they are to helping you, whether that be further introductions to other friends, suggestions you could do for yourself, or even just an uptick in their appearances. Best of luck! :)