While nothing prevents you from posting requests and commissions in here, it is generally a better idea to ask on the Minecraft Mod Development guild, also known as MMD, as they have a requests channel.
Make sure to follow their rules and to include important details in your requests like Minecraft Version, Mod Loader (Forge or Fabric), and Payment.
Their requests channel is available here: #1026620266698248262.
If you see No Access, you need to join the server with the following invite link: https://discord.com/invite/EDbExcX
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