The idea of growing a $100,000 ASX portfolio might seem like a pipe dream to some. But with the right mindset and a game plan, it is much more achievable than you might think.

You don't need to be an expert stock picker or throw in a huge lump sum to get there. The secret lies in starting with a clear purpose, committing to a regular investing rhythm, and letting the power of time and compounding work in your favour.

Here's how I'd go about it.

Start with a purpose, not just a portfolio

Before diving into stock charts or company announcements, take a step back and ask: what am I investing for?

Are you chasing long-term wealth? Looking to build up a stream of passive income? Or maybe a bit of both?

Your answer will shape everything – from the types of ASX shares you choose, to how much risk you're comfortable taking. Growth-focused investors might favour companies like WiseTech Global Ltd (ASX: WTC) or Life360 Inc (ASX: 360), while income seekers may lean into blue chips like Telstra Group Ltd (ASX: TLS) or ETFs like the Vanguard Australian Shares Index ETF (ASX: VAS).

Consistency beats perfect timing

Trying to pick the bottom of the market is like trying to catch a falling knife – more painful than it is worth.

Instead, I would focus on investing regularly. Even putting $1,000 a month into quality ASX shares could see you hit that $100,000 mark in just over six years – assuming a 10% average annual return.

Markets rise and fall, but dollar-cost averaging means you're buying in at various price points, smoothing out the bumps along the way.

Diversify and stick with quality ASX shares

A strong portfolio isn't built on one or two lucky picks. It is about holding a mix of reliable names across industries.

I'd build around a mix of high-conviction growth shares, dependable dividend payers, and a couple of ASX ETFs for instant diversification. The Betashares Nasdaq 100 ETF (ASX: NDQ) is a great way to tap into global tech growth, while VAS gives exposure to the broader Aussie market.

Reinvest and let it snowball

Along the way you are likely to receive dividend payments, but don't cash them out just yet.

Reinvesting dividends can supercharge your compounding returns. Whether it's via a Dividend Reinvestment Plan (DRP) or simply topping up your favourite holdings, putting your income back to work adds fuel to your long-term wealth engine.

Keep your cool when markets wobble

Lastly, remember that markets will always have moments of madness.

Staying invested through the noise is key. Emotional decisions – like panic-selling during a dip or chasing the latest hot stock – can derail even the best-laid plans.

Instead, play the long game. Trust in quality. And let time do the heavy lifting.