This is a really good question, and deserves clarification!
First, please read the updated recommendations. There is no recommendation that I know of that says to run a custom every day. Remember the importance of rest and processing time.
Three titles may not translate into a three core custom. A custom should be focused for better or faster results. Your stack that you are presenting is on three different topics: health, fitness, and wealth. This might make for slower results if these three different cores were to be put into a custom.
Also “am I ready for 3 cores in a custom” may depend on what are those 3 cores. How dense is each core? Are the cores regarding the same theme (such as health)?
For example, making a custom with NREE, RICH, and NWE might be viable as a three core custom. However Khan st1, Alchemist st1, and Khan Black st1 in a custom would likely cause overload. Although they all are focused on a healing type of theme, they are likely going to be a lot to process.