Avoid high market caps. And I don't also suggest Solana since if you will take a look at a higher timeframe and use such moving averages, it's still above on it (this is how I look at the market structure for long term).
Remember that it's not mean that an altcoin is currently high price or reached a peak, it is considerable for a short position. Well, just my 2 cents as I am not countering the trend.