Temporary dips are very common in bull runs, that's the way the market works. After a big run there is always a small correction, and after that comes the next run. Don't be afraid and hodl your coins.
Holding is the only key to get more profit in future. If you sell your valuable Bitcoin due to panic, you are forced to lose some dollar. It is better to hold then sell at low price due to panic. Now the price of Bitcoin crossed $9,800, in two days the prices will reach $10,000. Just hold your valuable Bitcoin for your future.
Holding is just safer method, but its not the only method to make profit. There are riskier, faster and all kind of other methods for making profit in crypto of fiat, depends what you wish.
But of you bought at top and price dropped the best thing to do is to hold and wait price recovery, in the beginning that was mistake I made often, getting out from trade to cut loses isn't good, price always recover, sooner or later, depends how high the top was. That's why tether is invented, of you wish to risk with tether you can always sell your crypto for tether and buy back in dip, but that oa day trading and this strategy needs to be used when price is reaching ATH or you are sure in drop. Trading a little with some part of your coins is recommended, its practice and risk sometimes can bring excitement and profit.