I joined the app Hello Talk. It’s a way to chat with people and learn a new language. I really like it for three main reasons:

I want to learn French, so I’m staying sharp by learning a new skill

I’m lonely AF and it’s fun to talk to people

It’s a way to practice social skills with new people (you can send voice notes and things like that)

You should try it! Vous devriez l'essayer!

Also (unrelated to HelloTalk but helpful for staying sharp) - I try to walk every day and either call someone or listen to a podcast.