Hi Sophie,
As Tricia said, the Welsh Speaking Practice group on Slack is great for having conversations. There are people of all levels, and Welsh infused with English at times is no barrier at all! There are sceduled weekly hangout sessions where up to 10 people can join a group chat, sometimes unscheduled hangouts that pop up from time to time, and you can also do 1-to-1 chats with people whenever there is someone online.
Have a read of this thread - Finding practice partners - a new resource - please share
Hope to see you in the group soon! 