I think the most secure trading is to use some money from trading capital and use money that will not be in use for the near future,
for example I have $ 1000 and I need to use the money for my family's living needs, then I can use $ 250 for trading and the rest to survive, do you mean from this revelation?
this method is used so that you are not too depressed if the money you have stuck in the expensive price.
You already have the right thinking in my opinion, that's what we have to do, we should not use all the money in our wallets to trade, and we can use 30 or 40% just to trade, and suppose we'll get caught up in high-priced trades, we will not be confused to look for money for our needs every day.