They already started their parachain auctions. This is when parachain auctions were announced by Polkadot, the price of DOT reached above $50, and is now below $40.
What I am worried about is after the parachain auctions, it could be a massive user will flow on Polkadot network after a lot of alternatives on Ethereum these days, like layer 2 networks. Another thing is Bitcoin dumping, but Bitcoin dominance is increasing, good for altcoins especially Polkadot which got a high market cap.
So for me, I can't say it is a good time now, but above are the basis you can consider buying DOT. I was able to add some of my DOT bag last May 2021 and will add more once we will drop below $30.
This is worthwhile point when considering Polkadot, as recent price action has been stimulated by the parachain auctions that requires DOT to participate, so is far from organic. There is then the chance that DOT will be exchanged for these new parachains, once they are launched, as some may have higher risk/rewards than Polkadot itself. Additionally, while it's price against BTC remains stable, it's price against ETH continues to decline, suggesting ETH is a better investment than DOT right now. Although some diversity when speculating on altcoins isn't necessarily a bad thing if not too broad.
Just my opinion, as another person on the internet. Do your own research, given that I haven't following Polkadot project for a while now.