tmmason10
Omono
While I also seek trees with better potential, I chose to have a big collection to have more to practice on. My collection ranges from; seedlings, small cuttings, box store bought, mallsai, and urban yamadori/collected. I think all of them offer different learning opportunities.
I actually fancy my "stumps" since they offer the most challenge.
Only group missing from my collection is properly "finished" bonsai. LOL
There are multiple takes to solving a problem but what is right is what works for the individual. In this case, sounds like he wasn't happy with too many cuttings, seedlings and so on, so to reinvigorate his take on bonsai I think the best way is to get more advanced material to bring the excitement back.
There's no right or wrong way, your way works for you and that's what matters.