Lots of adults meet people in various parks, to volunteer or go hiking. There are also fb hiking groups, sometimes Pokemon go ( or other online ap games ?). Walking dogs often lead to meeting strangers, and dog classes. Local human resources may have some other adult classes too, maybe pottery or cooking.
Some of the thrift stores, chess games, and volunteering with young adults, are especially friendly places. The weather will warm-up, and getting outside with more hours of sunlight may help.