Currently I only hold coins/tokens that are in the top 50, and currently I hold about 7 coins, Tron is the largest, which is about 45% of the portfolio, all of which I store in my android wallet, nothing on exchanges.
You can focus on the assets you have. and also make sure you have made a plan for every asset you have. but I'm sure you've made a good plan for your assets. don't have too many assets if you just buy carelessly. because investing without good planning will actually make your money wasted.