What is the highest possible price bitcoin could reach?

Everyone in here wants to see bitcoin at 100k per coin. But what will come after that? Let's say I would only have 100 bucks to invest into bitcoin right now. It reaching 100k wouldn't even double my investment. That's why we all love to invest into smaller cap coins altough it is most often a gamble. But how high could bitcoin reach? 300k or even a million? Am I really missing out when not investing in at least a little bit of the og coin? I think the current price is a big turndown especially for newer investors? That's probably also a reason why they go into projects like doge, safemoon and shiba inu.