Hell J-Jo!
Welcome to the fora!
Identify first if it is a bearing problem. When you spin the wheel while holding the uni, is it hard to spin forward, or is it just hard to ride forward and it’s a problem with the rider’s skill. You need a free spinning wheel to learn without immense difficulty.
Check this thread out. It is a nice log of someone learning to ride.
Keep us posted with your progress, and welcome to the world on one wheel!
https://unicyclist.com//t/journal-of-a-new-unicycler/75494/1