Refine 3D STL Model

I created a 3D model with Meshy AI and saved it as a single STL file. Before I send it to the printer I need a skilled eye to clean things up—remove any stray vertices, close holes, smooth uneven areas, and generally make sure the mesh is watertight and ready for reliable 3D printing... (Budget: ₹600 - ₹1500 INR, Jobs: 3D Animation, 3D CAD, 3D Design, 3D Modelling, 3D Printing, 3D Rendering, 3ds Max, Blender)