Hindsight's a tough teacher, right? Don't beat yourself up; many of us had our doubts about Bitcoin at first. The important thing is, you're embracing it now. Welcome to the crypto rollercoaster, my friend!
This is perhaps the shortest advice yet meaningful and complete.
Like what I have mentioned before, the best time to invest in cryptocurrencies is the day you discovered its existence. As soon as you found out and learned about it, then that should be the sign for the person to invest in order to maximize the gains that one would be receiving. With its volatility, BTC is the better investment both for short or long-term depending on your goal.
While I may have regrets of not investing sooner, I will not make the same mistake of doing nothing and maximizing this opportunity for the future.