Using systemctl restart NetworkManager will likely do it for you.

Or the more traditional ifup/ifdown method, but if you're remotely connected that's likely to give you a Bad Time as you fall off the network... :)

Set a crontab command that turns on your wifi to run every minute or two, thoroughly test it, then disable your wifi and wait a minute or two before trying to reconnect.

Try reboot, it will do exactly that and more!

Jokes aside, try sudo ifdown wlan0 and sudo ifup wlan0.