I think that it's quite safe to invest in Bitcoin now but I will suggest that you buy at intervals, also It is good to understand the wallets before investing. This is not just to Bitcoin but all investments.
Like buying on monthly basis or per year. I think this depends on the person because some who has analysis will buy one time in a dip because when you bought it on right time you can get profit than buying in intervals but only if you have enough money to buy but if you are lacking money then it is good only when you have money
Technical analysis, such as reading charts and using trading indicators, can be useful tools for making investment decisions. But I don't think it's too dominant. The important thing to remember is that technical analysis is not a guaranteed method of predicting market movement and should be used in conjunction with other research and analysis and on the other hand from my point of view if Bitcoin is still going down and trading advice is to wait maybe a good idea is better to take a step back and wait for the market to stabilize before making a decision