That is just pure trading and you run the risk if u sell at 100% and it ends up going further meaning you could have got 500% or more.
This pump and dump scamcoins are feasting on greed, you will lose this game going this way.
By selling at 100% or any profit - let it be 1% - you are not risking anything and you can bet with the money you have made continuing this safe route instead of risking losing it.
Not all altcoins are pump and dump , look at the like of Polygon and Cardano last bull run they did over 100x and still around today.
You do not make life changing gains taking 10 or 20% at a time.
I will have some altcoins that won’t do too well but I will have one or two that will do really well and that is all you need to see great returns.
If they don't offer any utility in real world, I call them pump and dump scamcoins no matter the price as it's just a bubble without any real world usage.
That's why my safe bet is on Monero as it has utility and even I am using it on daily basis to buy stuff and online services.
Ask yourself, when did you last time used Cardano or Polygon to actually buy stuff ? if you didn't and only read that it has adoption then it's a worthless scam.
This is my approach to investing, safe and secure.
As for life-changing gains... if you keep investing like that you will most definitively have a life changing experience but not in the way you would like.
As I've seen, Monero does have lots of businesses that use it as a payment method, however, why the coins that just lay around and wait their time to shine are "worthless scam"? You can anyway change them and Monero too to some stablecoins, which also can be used as a payment for something.