High apr interest accounts? Need suggestions for what to choose

I'm wanting to earn as much money as possible but I've maxed out on all of my accounts and would like to open another account.. i don't like accounts where you can't add money at anytime because I'll never have a big chunk of money to put every 6-12 months for things like CD.. that's lost interest... i opened a second account at a local credit Union different from my main credit union and get 6.0% interest in my regular saving up to first $500 and 4.50% up to first $400 in my checking account i only use this bank account for savings.. i can't open another account at that bank because I'll be at 0.20% interest rate for both even on a different account number.. ive maxed out both and need another account.. what should I go for? All suggestions are taken