Your point makes sense. But I find it difficult to figure out what SaaS I could offer, because:

1. I get new client maybe once or twice a year.

2. I solve very case-specific problems for my clients.

So, very few clients with very different goals.

Thanks for suggestion, I guess I didn't think about this hard enough. If I'm already in a very warm contact with people who is capable of spending thousands of dollars on software every month, they must be interested in some kind of SaaS.

your new clients aren't limited by your old clients. if you have a saas idea you think is good you should go for it. courses can be profitable, but vast majority aren't, it's a fairly crowded space. might work, idk, I'm not from this space. just seems like a hella lot of work and you could make more for less in your field.