There already is some very good advice in the thread.

My advice to any newbies coming into Bitcoin and the crypto market in general is this: Learn to treat your BTC as money and do not see it in terms of its USDT value.

Most newbies come in with the hope of increasing their Fiat net-worth by day-trading the BTC swings or by catching one of those insane Alt-coin rallies. The right approach is to actually recognize your place in the world first. If an investment of a few 100 dollars could move fortunes then everybody would already have done that. That never happens.

You build your BTC holdings with slow accumulation. You can also build by finding projects that have a well known, open dev team and then get associated with the intention of understanding and actually contributing. See crypto as a great opportunity to learn and earn together. Don't see it as a means to accumulate fiat and retire. When you actually become involved, better opportunities will start coming your way.

Simply relying on trading will lead you to the situations of FOMO and anxiety like the one you described. We have all been there.