Here is a good list of some high yield Exchange Traded Funds (ETFs) that I researched. I was looking specifically for funds that had minimal declines during the Covid crash in Jan-March 2020. I looked at these closely and have a high level of confidence in them as sustainable with that limited volatility. The Pimco one PFN I already own and it had a decline but I like the yield and even with the expense ratio it is a very good fund for me that I have had for years. The Vanguard BLV was pretty steady during those volatile months in 2020. First Trust Preferred Securities and Income ETF (FPE) is actually an actively managed fund. I like that flexiblity in a fund. Here are the funds I found and their current dividend yield.
Vanguard Long-Term Bond Index Fund ETF Shares (BLV) yield of 3.17%
First Trust Preferred Securities and Income ETF (FPE) 4.83%
PIMCO Income Strategy Fund II (PFN) yield of 9.2%
Invesco KBW Premium Yield Equity REIT ETF (KBWY) 8.67%