At the end, we just lose money in margin trading and I have seen little to nobody who has made profits in the long term trading in futures.
Both Cross and Isolated have their pros and cons. If you want to play safer then Isolated is a better option since you can rethink of a better strategy for the rest of your trades.
LOL your first paragraph is hilarious. I sense some sarcasm there.
Generally you should only use isolated especially since you are trading many alt pairs. If you are only trading BTC or ETH then generally you can get away with cross.
However you shouldn’t use cross if you got multiple high leverage positions opened on many alts because a simple liquidation cascade can make you lose the entire account.