Honestly, Fiverr is the best site. You can share your gigs on your social media channels, to your email list, family/friends, word of mouth and so on. In terms of other 3rd party sites, good luck, most require some form of paid advertising. You can always start a blog but that could take years to build up. There are no tricks with Fiverr. The best way to find success on this platform is to master it like a good student would. Fiverr offers a ton of resources from their podcast to blogs, plus this forum. Fiverr puts it all out there for us sellers to succeed. If you want to become a better seller I suggest increasing your knowledge, start reading and/or podcast education. Then test what you read or listening too.