I use MACD often for crosses and plateaus. If you like RSI, you might like the Stochastic RSI better because it is more responsive to price movements than the regular RSI, but honestly, I don't use RSI. Either SMA or EMA is fine, it's really the trend and crosses that you're looking at, so I've noticed no difference in which one I use.

Low deltas like that are fine. There is a website called CMLVIz.com that does stock and trading research. I learned from them that empirical data and backtesting shows that delta 70 options yield the best risk:reward, so you will often see a lot of volume on those ITM options. I usually don't go much lower than that.

Selling options can be really scary if assigned, but the other long leg of the option spread is supposed to protect you from unlimited loss. I usually only sell a credit spread when I have a good feel for a move. So, if I confidently foresee a down move in the coming days or weeks, then it might be an opportunity to sell a call credit spread, and shoot for 10-50% profit, GTC order once executed. Holding for 80-100% profit can be done, especially if near expiration, but also prolongs your risk exposure. Maybe better to capture the "lion share" of your profits, and just set up a new trade.

I'd say, at least for me, that the InsiderFinance technical indicators were a game-changer for me, because they automatically calculated trend and Price Targets FOR me, and I look mostly at the Daily chart. Another indicator I use almost always is the Squeeze indicator - it is free on most platforms, but it was invented by John Carter - the founder of SimplerTrading.com that I mentioned previously. It measures consolidation and gives you a signal when an imminent burst of price movement is expected. You can find education about it on their website, or probably free on YouTube.

I think credit spreads are an interesting way to 'play' the market, but can also be dangerous for losing your margin if it becomes ITM. You might also try debit spreads or simple long options where your risk is only what you pay for it, without the risk of losing a large amount of margin.

If I had to boil down what I use for evaluation technicals it would be the InsiderFinance indicator package, the Squeeze Pro, and the Sequence Counter (free on TOS). I use ONLY these indicators when day-trading, swing trading, and investing.

Thanks again for reading and I enjoy your comments and questions! :)