BTC will always be a good for investment even though its current price of is unstable but it is still good for long term investment. I have invested a lot on potential crypto project way back 4 years. The same scenario this date where the value is decreasing. But holding it for a long time it gain almost 1000%. This is how the flow of a crypto market, my piece of advice invest what you can afford to loose according to your financial capability and don't buy if you don't have enough reserve funds.
investing money that is ready to lose is indeed the best way. because after all the very high risk in crypto investment needs to be realized. I did the same thing as you did. Bitcoin investments are by far the safest compared to altcoins. But back to the assessment and analysis of each. because everyone has their own judgment and analysis. and one more thing to avoid in investing is to use the borrowed money.