If you have created something you wish to share with everyone, that is what MakerWorld is for.
If you wish to brag, you can add a new post in the category “off topic” and sub category “successful prints”.
If you haven’t established yourself yet, and this isn’t something special it will likely sink without a trace.
Once established, and have been on the forum for a while offering up help to others, you can cherry pick your best work and add it to the following post.
Do not upload everything you create it will come across as spam.
People can be unforgiving, I recommend you spend time seeing what others do before you even consider doing anything.