This has been a painfully lonely time for many children. There's no good solution for this. But here are some ways, I've found families have navigated the social isolation piece

-small online clubs -daily scheduled facetime with friends -focusing on developing/nurturing healthy relationships with siblings and parents (this goes along way in building healthy attachments later in life) -socially distanced hikes with friends wearing masks -make friends with one other family who is also socially distancing.