Another Clickbank alternative isJVZoo. It has a lot of digital products you can promote.
Then there is Warrior Plus. There are plenty of digital products there.
A quick note about digital affiliate marketplaces:
There are plenty of garbage digital products out there. Many of the ebooks and training programs aren't worth the price they sell for.
In addition, you have to be extremely careful in the "make money online" and weight loss niches, because these tend to have lots of outright scams.
When using Clickbank, Dealguardian, JVZoo, or Warrior Plus, you always have to do your due diligence before promoting any product. It's probably best if you try it out yourself.
Of course, you don't have to use these platforms at all. Many private digital products and companies have their own affiliate programs, and if you find a legitimate digital product, look for an affiliate program.
Of course, Wealthy Affiliate is a great product to promote, being that it's totally legit, has recurring commissions, and is free to join.
To promote Wealthy Affiliate, you might want to go through the Affiliate Bootcamp lessons, which you can find here: