It takes a lot of patience to be a trader mate. If your plan didnt work you should have another option because if you will quit right away you already accepted your loss. Keep in mind that you wont be a millionaire in 1 day so learn from your mistakes and apply it to be better.
That depends on the purpose of changing your altcoin, whether for speculation or for a safe investment. For speculation, I suggest that the altcoin that is owned is sold then buy Bitcoin, because now it's experiencing a bullish market.
But if you want to feel safe, of course selling altcoins and buying USD of course the finance will be safe because USD is a currency that has a high level of stability. Very rarely fluctuate quickly and large, unless there is an extraordinary event.