Unable to get certain bluetooth accessories paired with iPad

I have a IPad (11”, 2nb gen) with 3 accessories that work currently. I have tried to get a few other accessories to attach but they don’t show up on possible attachments (smart home items) and my watch (VeryFit) that was attached previously. After trying to get my watch to work with Bluetooth, while it was still attached but not connecting, I tried disconnecting and reconnecting but now it doesn’t show up as a connection on Bluetooth. Any suggestions?

[Re-Titled by Moderator]