What was the dialogue again .... Bees don't waste their time explaining to flies that honey is better than shit!
Having said that, the knowledge, experience, stress management and patience you gain from owning a business is NOT WASTED on you, and I sincerely hope you can start again.
Now that you have highlighted your flaws and limitations work on Diversifying your skill set and exposure towards potential clients.... if you are doing ads .... the latest trend is "acting" like a digital marketing company and approaching companies. You can also design your own products for example if you arent getting alot of gigs make a product on the side lin e such as playing cards and launch them on Kickstarter or shirts, stickers etc. Last but not the least follow the big accounts on IG and see how they market themselves .... search made by James he's worth following