Bitcoin is an investment that has a high risk and high revenue. So before investing you should know with certainty that we can never be 100% guess bitcoin price in the future. However I support your choice, current prices were declining and this is indeed the right time to invest.
For me it is the best decision, you choose bitcoin over bank. Because even if the price is volatile but still we can earn money that banks can't give it to you. Just be patient and bitcoin give you double with what you expect to earn.