The experience that i got from my last trade is as follows.

1) Never invest your whole $USDT in any currency.

2) If you get losses if your currency graph goes down then make other trades on the same currency i.e. ( I have purchased 90 $meme at 4500 and now meme goes down to 4460 i purchased 90 more now I can sell meme 150 meme at 4490 to recover some loss.

3) Never hold coins for a long time. time is your money.

4) I recovered some losses from other coins.

5) Always watch a coin graph before purchasing.

6) Use the limit option for perfect timing

Experience shared, may be helpful for other.