Here's a recent topic where I posted my looper recommendations:
https://www.acousticguitarforum.com/...d.php?t=534400
There are lots of different things you can do to encourage "practicing", and my barebones looper setup has been a lot of fun. Investigate exactly what you want to accomplish with a looper; it's very easy to pick out something that might not mesh well with how you intend on using one.
Do note my recommendation for a dedicated stop switch. The single button loopers are difficult for most folks to use well.
I initially put a toe in the water by purchasing a Zoom G1on multi-effects pedal. This $60 multi-effects unit has a built-in headphone amp, nice built-in drums, and a rudimentary looper, but only good for 30 seconds. If the G1on had a decent loop length it would be an IDEAL practice aid. I loved using it, but the 30 second loop time was too restrictive, so I opted for the dedicated looper shown in the photo on the linked topic.