MTB Project / Trailforks are a great resource around here.
Personally check some of the trails Flying Squirrel / Country Club at Alameda park (butler, pa), Iron Gate in Frick, Dr J / Koto buki in north park.
For road trips to some riding destinations within 3 hours or so, head up to new trails at Jakes Rocks in Allegheny National Forest, Some fun techy riding down at Big Bear WV, or awesome smooth flowy trails at Allegrippis trails @ Raystown Lake.
Look in to a road trip to a bike park (Snowshoe WV is Rad from what I hear), some other possible options, but many may not be open due to covid (and nearing end of the season, where they switch to ski).
https://mtbparks.com/Pennsylvania/258-Blue-Mountain-Bike-Park-Pennsylvania/View-details.html
Follow "Trail Pittsburgh" on Facebook, they are the local IMBA Chapter and have some good info.
Check in with local shops that sell MTBs and host MTB Rides (Trailfo Bikes, Flat Tire Bikes come to mind)