Not a good plan, most people have done this and in the end they would have done better if they held the first coins, the thing is it's not easy to find gems.
...stop jumping from one to another project.
Exactly It is not idea to sell one coin and invest in a lower project, that calculation might run at lost because the risky there very high. You have been investing in a particular token or coin and the coin has declined or reduce in price and you just like to invest in another coin that is more lower than the present coin you are investing so that you will gain more, hey mate, experienced is the best teacher, I have done that and I don't think I will advise someone to do that again because you will lose the more.
I sold some of the percentage of Bitcoin to invest in Ethereum and I can see the loss I made from the investment. I invested in Ethereum when the price was $3,658 and that is about 4 month now and till now the price has not reached $3,400 and I have sold 20% of the investment as lost price. Jumping from one coin to another is very dangerous. You can lost everything in the process.