Selling less puts with cash Vs more puts on margin

Let's say, I have around $500k invested in various stocks like Apple, Google, Microsoft, S&P 500 and others. Now I have $100k cash in my trading account and my goal is to generate 2% returns every month ($2k) on this $100k.

The way I do that is currently is to sell put options for a total of 100k on stocks that yield good premiums like Broadcom or Tesla at 0.15 delta. But sometimes, because of the high volatility, they get assigned and I want to avoid assignment as much as possible.

Now I heard about margin trading which I have not used before. My understanding is, with margin, I can have more buying power for the 100k and sell more options. So here is what I am thinking: instead of selling cash secured puts for 100k on 2 different stocks, sell puts with margin for a higher total value like 200k and sell the options conservatively at 0.07 delta (compared to 0.15 delta before) on 4 different stocks with the goal of generating 2% monthly ($2k) on the 100k of my money. This takes advantage of the margin and also reduces risk by going for lower delta, lower premium and diversifying the investment. Any obvious flaws with this strategy? Where can I learn more about this?

Also, I believe I can have even the 100k invested in let's say SPY and let it grow and in the worst case when my sell put gets assigned, I will have to sell the SPY to fund the put call assignment. Does this sound right?