If you've ever thought investing was only for the rich, think again.

With just $300 a month, the average Aussie can put themselves on a path to serious long-term wealth — especially when that money is invested consistently in high-growth ASX opportunities.

It is not about timing the market perfectly or finding the next big thing. It is about showing up every month, letting compound returns do the heavy lifting, and backing businesses with genuine long-term potential.

What could $300 a month in ASX shares become?

Let's break it down.

If you invest $300 a month and earn an average 10% per year (in line with long-term market averages, but not guaranteed), here's what your wealth could look like:

• After 10 years: $60,000
• After 20 years: $215,000
• After 30 years: $625,000

That's the power of time and consistency. You don't need a lump sum — just a strategy, a little discipline, and a few high-potential investments.

With that in mind, here are three explosive ASX opportunities that could help fuel your wealth-building journey.

DroneShield Ltd (ASX: DRO)

DroneShield is at the forefront of one of the fastest-growing segments in modern defence: counter-drone and electronic warfare technology.

As security threats evolve and drone use becomes more widespread, governments and military agencies around the world are ramping up their investment in solutions like those offered by DroneShield. The company has already secured contracts with high-profile defence clients and continues to expand its global footprint.

DroneShield keeps winning contracts and scaling operations, early investors could be well rewarded.

Bell Potter is bullish and has a buy rating and $1.50 price target on its shares.

Megaport Ltd (ASX: MP1)

Megaport is helping reshape how the world connects to the cloud.

The company provides on-demand, scalable connections between data centres and major cloud providers. As businesses everywhere shift to digital infrastructure, Megaport is in a sweet spot.

After a period of restructuring and a leadership change, Megaport is now focused on driving profitability while still growing globally. The long-term trend — increased demand for cloud-based connectivity — is well and truly in its favour.

Morgans is a fan of the company and has an add rating and $14.00 price target on its shares.

Pilbara Minerals Ltd (ASX: PLS)

Finally, lithium might be volatile, but it is also essential. Pilbara Minerals is a major player in Australia's lithium sector — producing the raw materials that power electric vehicles and renewable energy storage. While prices have fallen heavily in recent times, the long-term outlook for lithium demand remains strong as the world decarbonises.

This ASX share has low-cost production, strong operating margins, and room to grow. For investors who can handle some short-term volatility, it could be a compelling way to play the energy transition megatrend.

Bell Potter has a buy rating and $2.00 price target on its shares.