Yesterday I read post describing if a coin has more circulating supply don't buy that, I've little concerns over it.

It is not what's the price is, what matters is for how much time you hold the coin.

Let's say:

If you have purchased bitcoin at

7000$ and now it is 47000$ means 7x

The same you could earn with doge if you have accumulated earlier although doge is a meme coin having no fundamentals so leave doge for now

Let say you have bought ada at .10$ (when btc was 7000$ ada used to be even lower .10$)  now recently it touched .99$ so almost 10x. So you got 10 times profit of your initial investment. So circulating supply doesn't has so much impact.

Yes there could be a minor difference as BTC is king and will always be as it came earlier than others so has more hype but if put btc aside and compare other coins with limited supply you can get 10x with any good coin having more circulating supply.