Man it's so hard to tell someone where to go with their projects because so much of what you can produce is subjective as to what you personally find attractive/ like. And where you eventually want to end up with your projects.
Also I wouldn't consider anything you've done so far a "mistake" because after all you have produced successful clutches and they are animals that you enjoy. So congrats!
If I had those animals and only them and it were me I'd probably put the pastel clown male to both the spiders. Nothing would be very expensive but there are a lot of het clowns you can produce with them.
Then I would invest in some het females that will add genes to clown that you don't currently have. Ex. Enchi fire het clown would be a cheaper het that would work very well with your pastel clown. And eventually one high end clown male to breed to the hets. Keeping the pastel male as a back up male.
But again all of this is so subjective as I personally like clown and would work my projects around them. Also as the above posts mentioned its all about researching your projects. Planing planing and even more planning. Try to think several generations down the road. What you want to make from one pairing and then where to go with the possible offspring from that. I can see you started that with the bel idea.
Also there are other morphs in the bel complex that may work well with your lessers and other morphs. For example bamboo is a stunning morph that is in the bel complex and you may find that that is something you would like to work with. Keep in mind with the bel if you breed a several gene animal with another and end up with a bel you may end up turning a several thousand dollar animal into a $600 animal because you won't know what is in it and will only be able to sell it as a bel pos whatever else. So if that were something I was getting into might choose go for lesser x lesser so you know only gene in there is lesser and you have 25% chance to produce bels 50% lesser and 25% normals.
Can't stress enough how useful the morph market calculator has been for me. You can plug in the morphs see your pos outcomes and then next to that click and see animals for sale that have those genes. I spend probably a year on there and online and shows looking at morphs I like plugging them in and seeing what I could produce.
Sorry for the long response but get me talking about snakes an I'll never shut up lol.