What are the best ways to make a prototype or model of a designed 3d model of my product

I have created my prototypes of acrylic, resin (by process molds) but the best material with which I work is the "trovicel" its properties make it a good material for models and prototypes of mechanisms, it can be molded by means of heat, it can be as hard as wood but it is cut very easily with a cutter, it is stuck with some industrial glue or you can rivet it, I hope to see you helped
tutorial:
https://www.youtube.com/watch?v=cxFM3vsnh0A

It depends on the design (size, material, etc...) and what you need the prototype to do such as does it need to be functional, to scale, correct material etc., or is it simply for visual purposes?

That said, 3d printing and machining are the most common types we do for most parts, and if we have material or quantity requirement needs that go beyond the capabilities of 3d printed material, we often have a silicone mold built and make parts from liquid urethane. Silicone molds have a limited number of 'shots' capable, but you can get better material properties and higher quantities cheaper.

Physical and chemical properties

- Very light
- High flex capacity
- Thermal and acoustic insulation
- Does not rot, swell or splinter
- Does not absorb water, does not keep humidity
- Self-extinguishing
- Absorbs vibrations
- Thermoformable
- Resistant to chemical and corrosive agents
- Easy to manipulate: can be cut, nailed, drilled, screwed,

perforate, paste, paint, screen and print digitally.
- Can replace wood

Based on the limited information provided, Robert's answer is great.
Without know details about the shape, complexity, purpose, size.... and other factors. It is pretty much impossible to do anything other than guess at how it should be made.

Not having CNC or anything else around you should not be a limiting factor. I have to assume that you have mail delivery. So, you send your design to a company which can make a prototype, and they will mail it to you.
You could also purchase CNC equipment, or a 3D printer, and you can become the supplier for your own products, and other inventors in your area!

Is it a 75mm tall plastic model of Yoda?.... or a turbo-pump for one of Space-X's rockets?

Need more information. :-)