1. The site doesn't really add much value on top of existing template sites that already have a search feature. In some cases an even more feature full one.
I think for me the value would be in not having so many filtering options but actually less. Build something smart that figures out why I want without me having to make many different selections. Reduce the options.
2. Even if you do that, is the market for templates that big and is what you're building hard enough to replicate that the template sites won't copy it immediately if it succeeds?
aka. are you solving a real problem? or is this solving a problem that doesn't exist?
I don't buy templates but I'd guess the market is fairly small and most template buyers aren't recurring buyers.
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So what do you do - I think you should explore what you've built and look for something you can salvage. Then apply it to a real problem.