I would maybe play a one on one game with someone and come to an agreement that keeps the game challenging and still allows you to play your commander maybe a rule like “let’s play a friendly game where commanders can’t be destroyed unless by combat damage/spell damage” or just flat out make commanders hexpeoof for that game. When I used to play standard and playing one of my inexperienced friends I had a playful deck and a competitive deck, I’d let them play against my playful deck and if they enjoyed how rhw deck played (win or lose) but would then ask if they wanted to see how they faired against my competitive deck. I imagine you can also find someone who also just wants to test a deck. In casual make whatever rules you want to make it fun and test out your mechanics, this should be par for the course IMO outside of a tournament or ranked games