Question regarding UTXOs

I’m new to the Bitcoin world and I’ve been trying to read, search, essentially learn more about all of this. I read an article regarding UTXOs, and I have a quick question from everything I learned so far.

My question basically is:

The biggest the amount of Bitcoin you are able to accumulate before transferring it all to a cold wallet the better right? For example, if I’m able to collect, let’s say 0.5BTC in a determined period of time, I’m better off stacking all these purchases and wait maybe until I have as I said 0.5BTC and only then I should transfer it to my cold wallet. Am I right about this?