In my perspective, It is not too late to invest in Bitcoin.
A very low percentage of people own Bitcoin.
Take a look around you. How many people actually have Bitcoin?
Its a low percentage, perhaps around 4%.
Bitcoin is only owned by less than 5 million people worldwide and still has tremendous growth potential.
Everybody thought they were too late at $100, $500, $1000, $5000, and now almost $10,000.
Nobody knows the answer for sure but its worth researching and getting into with a small amount of money that you can afford to lose.
There's a saying in Crypto world.
Keep calm and buy bitcoin

Your right 100%, It is not too late in investing with bitcoin and still, some people are worried if they can be able to invest and earn with it. As you have said whatever the price is, it is not too late and it is already proven on how bitcoin price can increase as much as almost 30K and for sure that it will soon go up again. You will not lose anything when you just try to invest little by little, It doesn't matter how much you started but what it matters is that the knowledge and the experience. Never stop investing and this really benefits you in the future. I myself started at 3K and at that time I'm thinking how high it was but as I look at it now I did not regret starting investing with bitcoin.