Welcome! I transplanted here with my husband 8 years ago! We had a good time going to all the craft brew tap rooms. Union was our favorite, check that out. Now that we have kids our social outings have slowed down so I can recommend a ton of family friendly and kid stuff but if you're child free that won't help lol. But yeah, just going to local breweries and hanging out we met lots of cool people that way. Baltimoreans are a friendly folk for the most part and I think that they are very welcoming of transplants.

I will also suggest enjoying the area's natural beauty. In the city Jones Falls Trail and Ft McHenry are nice and in the county I like Marshy Point and Gunpowder falls (there are several areas, all worth checking out). Also I've had a lot of fun joining local urban foraging groups (again, having kids has slowed me down so I haven't in a couple years) and if you google that stuff should come up. I met lots of great people that way!