Since you're asking for Bitcoin investment advice here, the answers you get will be almost the same. It's not too late to buy Bitcoin and if you wait long enough, you're sure to make a profit.
However, it's important to realize that we are now almost at ATH prices. If you only wait 1-2 years, you are likely to suffer losses in a possible bear market reversal. If you wait at least until another bull run after the next cycle, your chances of making a profit increase significantly.
Instead of investing $50-100k in Bitcoin all at once, it makes the most sense to buy it gradually over days and weeks.