Can only trade ETFs

I work at a firm that restricts me from trading equities. Previously my bread and butter was doing cash secured puts and selling calls and riding out the time decay. I'm now limited to trading ETFs only now. I've been doing some credit put spreads for some premiums but honestly the risk reward for the little premium is not worth it.

Selling csp on something like QQQ and SPY requires too much capital but trading any other ETF is difficult bc there's little to no volume/ open interest. What other ETFs am I missing that has high volume? Does anyone else have a solid strategy for ETFs that they trade routinely? Ideally like to continue collecting premiums and not blindly buying calls and puts. Thanks