Friends for my 3 y.o.

Hi! I'm a sahm with a 3 yr old, 1 year old and 20 weeks preggo with my 3rd and last kiddo. My son used to have a pretty big circle of neighborhood friends that have since moved away. He is always asking about them and is always so disappointed when we go to the nearby park and there's no kids there. We like to do last minute park plans, playdates, hikes etc Does anyone want to hang out sometime? We live in off north carefree and powers area. he desperately wants friends and I feel bad that he doesn't really have any one around anymore.