It does not matter at what point you enter the market for a coin if you believe in the long-term. Bitcoin was once expensive at $1; it was then expensive at $10; people could not believe it when it hit $100; people could not believe it when it hit $1,000 and when it hit $10,000 they called it a bubble. It could be $25,000 next year or drop back below $5,000. My only advice here is not to chase something during a parabolic upwards move because it will almost certainly come back down. 
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Only invest what you can lose. During the recent crash in January 2018, hobby-investors got burned. Reports of frustration and losses came at the cost of broken monitors, smashed laptops, and heavy monetary losses. While the rules are in more particular order of importance, it’s safe to assume that this is the most important rule, the rule to rule the rules. As soon as your money is converted into cryptocurrency, consider it lost forever. There is absolutely no guarantee you can get it back. Losses don’t simply come from dips in the market; extraordinary factors such as hacks, bugs, and government regulation can mean you’ll never see any of your money again. If you are investing money you can’t afford to lose, you need to take a step back and re-evaluate your current financial situation, because what you’re about to do is an act of desperation. This includes: using credit cards, taking out mortgages, applying for loans, or selling everything and traveling the world (as glamorous as that sounds).