Hey Sam. Thank you for reading and commenting. When you say barrier to entry, I'm not sure if you mean price-wise or how complicated/easy it is.
Right now, Ethereum is probably the safest DeFi play. I see owning ETH as a play for the entire DeFi ecosystem. I imagine most DeFi projects will follow ETH's trend.
If you want to dive a little deeper, you have to consider what your risk comfort is and how long you are willing to be invested. Some lower (I say this lightly) risk projects I like are AAVE, SNX, and GMX. These all generate revenue, have a high user base, and can be transacted with low fees. Not financial advice, but I do own all 3 of these.
If you are interested in moving further out on the risk spectrum, you could look at Drip or Furio which are daily ROI projects. I am also invested in these. They are much higher risk than the project mentioned above.
And don't feel compelled to invest in DeFi right away. We are in a bear makret, and accumulating BTC is my primary focus during these times. Right now is a great time to research projects, make a watchlist, and maybe slowly move into projects you understand and see value in.
Sorry for the long-winded response. It's hard to suggest things when the market is so volatile right now.