Market always looking good for investing but you need waiting for when coins have lower price, never make you panic and hurry up to buy some coin when have higher price, this very risk and bad way if you wanna buy coin during have lower price. I think most profitable is looks carefully with some coin to buy and never take risk with higher price keep entry buy.
Well for me deciding when was the good time to buy or to invest in any crypto depends on the availability of your capital and of course depend on how do you study the market of the crypto you're up to invest with. The market today was insanely good for investment but of course the price was to high compare to the past price like bitcoin that after hitting the new ATH wayback 2020 it keeps its high value increases reached $58k. No one had ever thought that it could happen that too fast, that's why theres a lot of good opportunities comes to crypto like attracting more investors who saw a great potential of crypto in investment.