Lots of nice words, some silly ones too, in this thread.

Reality is just a little simpler yet more complicated.

You bought "high", as in you bought during a bullish moment of growth. That's only a mistake in some very specific cases, so unless you used your rent/food money to buy those coins, and unless bitcoin died tomorrow (hint, that won't happen), you did fine. Not brilliant, but fine.

Now how to deal with the current collapse (other hint, you've not been in a crypto crash until you lose 60-80% of your potential value)?
This answer is where the simple yet complicated decisions come, and it's up to you.

Did you use money you needed in order to live to invest in bitcoin? Sell, now, at a loss, and don't come back until you've got money you can afford to light a cigar with.
You will rot your blood if you play with money you need to live off.

Did you buy these coins with a large fraction of your "superfluous" wealth? Then hold tight onto them, chances are very high that eventually price will increase above and beyond your entry point. Is it guaranteed? nope. Do we have a timeframe? Sure. Something between a day and a decade.

Do you have a considerable amount of superfluous funds you are interested in using to invest? One possible strategy is to lower your break-even point by purchasing additional BTC at price-points lower than you did when entering. Word of warning, this increases your exposure and potential loss, and needs to be done with care. a possible strategy is to set yourself budgets. Say... I will purchase 0.1 BTC if it hits 3900, then another 0.10 if it hits 3800. then 0.2 at 3500. maybe finish with 0.3 at 2500 and 0.2 at 2000 as placed orders in case of a full correction or flash crash.

These are just some of the options you've got. Just keep in mind that if the value of bitcoin worries you, you're playing the game wrong.

We all need to be here with the knowledge one day our crypto networth might become irrelevant, valued at 0. This resignation is what lets you act rationally and clinically when investing. Also, and learn this quick, never keep all your eggs in one basket. you win some, you lose some. be sure to always have something else.