That's the trouble with me, the times I can make aren't static or reliable (I live in a madhouse!), just "the later the better". I managed the later ones because they were midnight, my time, and everyone else had gone to bed
Might I offer you a piece of unwanted advice?
Create a schedule when your races will be (same day and time every week, for example) and then stick to the plan.
This will help interested people to reserve a spot in their agenda.
Also, when asking for people to join, it won't help saying that you are actualy busy and would rather cancel then go on with it.
I really like your enthousiasm, but it's all a bit hap hazzard the way things are going lately.
Maybe it would be better to join some well organised events your self and learn from them, before trying to run your own league(s).
This shouldn't be an advertisement, but Absolute-Beginners.nl is doing leagues for many years now, with well organised servers and Lapper software (I am running their servers and writing their software as well), with people joining that are beginners as well as very good drivers.
This all makes for a nice field week in week out (every sunday evening), but there are more very well organised leagues to choose from.