You can buy BTC all the time when you are financially buoyant, don't forget that all investors are not equal in this industry, and it will be favourable to buy BTC in the bear run because there is a chance for investors to boost their profits in the bull season.
Financial buoyancy doesn't mean one is ready yet for investment. However, it is more a criterion to being any investment which is having the capital yet and stability to invest in the long term. Just because someone has the money doesn’t mean they should invest without a plan. A person should assess their goals, financial obligations, and overall strategy before investing in Bitcoin. Most persons who started investing a long time ago and held till this current ATH. It was not all about the finance alone but the goals they set for long term.
One thing you must know is that bitcoin investment is not like other investments. Bitcoin investment is simple to start and doesn't require so much planning to start. Once you are financially okay, you are in a good position to start your bitcoin investment because you are certain of a good discretionary income that will allow you to invest in bitcoin comfortably and still sort out your daily expenses any time they arise without finding it difficult to do, which will allow you to hold your bitcoin investment for a very long time. As you are in your accumulation journey, you can plan how much of your discretionary income will be used in accumulating bitcoin, how many bitcoin you want to accumulate, and how many years you want to hold your bitcoin.