September is the last decline this year so far, because in October and November Bitcoin and the market continued to rise, but at the end of this month there are still more than 20 days left, we will not know whether Bitcoin will continue to rise or will fall.
buying now and building your portfolio is not a bad thing.
and currently bitcoin is experiencing a decline, I think this is normal because it has been almost 1 quarter that bitcoin has continued to rise, there is news that microstrategy sold some of their btc before the halving and other things that caused bitcoin to fall.