There is no strategy.
Just see if the altcoin is good enough, have high trading volume and come from reliable team then just throw money at it.
But i will be selective, usually only coin that have strong community gonna go up when bullrun came, the rest just stuck in their all time low.
I think there's something they can do and basic thing to do is don't by crap tokens in the market. Because those tokens usually die when bear market season occur.
Just buy top altcoins if they really like diversification and don't want to focus on Bitcoin.
If it happens that bear market starts to happen then they better act smart and don't get panic. Better hold their coins bought and don't ever think about sold it a t loss since usually those top coins have good potential to recover and for sure that they would never lose their money with them unless if they sold it.
In regarding about surviving altcoin bear market then the best approach would be is on how you would be able to survive the bear and wont be able to panic out on selling those assets. Actually its that easy to say but it would be that so hard when you are on the actual market condition on which it would be that so hard to make yourself that be able to sustain or be able to resist specially if you do saw your coins are dropping when it comes to value. Its not always been that ideal that you should be always keeping on checking about on whats happening on the market specially if its a bear market because most likely you would be having that possibility that you will be making out such action. Surviving on an altcoin bear market would be a long time holding considering that we do have that 4-year cycle. The best approach is to accumulate rather than on minding on whats the current value of your holding.
The most common mistake on here is that majority is that they are going for low caps on which they are trying out to maximize potential big profits on which this is understandable but It would be that wise that you would be focusing into those established altcoins in the market if you do opt out for long term and having at least that credibility and community strength but if you are that loving to take up some gamble with low caps or even with meme coins, then it would be that up to you. It would be just that basing on how well you do make out decisions in between these kind of investment options.