yesterday I saw a tweet from someone who invested $500 in BTC when it was at $82,000 and now their investment is worth $3,000! I felt regretful for not investing earlier and wished I had converted my money to BTC.
If you are aware of the potential of bitcoin then you will never regret. It means today is not really too late to invest with bitcoin. Bitcoin is speculated to test $100k - $200k - $500k - $1M levels until end of 2025. So, you may start DCA on regular interval. This is not a recommendation and I am just stating what I personally believe from the knowledge I gathered. Take time to realize the risks of bitcoin investment and act responsibly

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I'm considering a new strategy: if BTC's price drops a bit, I'll invest the money I have and convert it to BTC. Please share your honest thoughts - is this a good idea or not?
You may wait for a drop and you may catch the bottom but no one could predict the exact bottom in both short and long run. So, the best strategy must be DCA. If you are planning for $500 then buy for $50 on 10 different days or 10 different weeks. DCA will help you to buy at best possible lower price (in average).