In a bull market when Bitcoin prices start to explode, and you are in an altcoin, the ideal timing to exit depends on following Bitcoin's movement and behavior in the market.

Some strategies and points to help you decide when to exit altcoins:

1. Bitcoin Psychological Levels (70, 80, 90, 100k):

Bitcoin price at 70k: If Bitcoin approaches this level, altcoins may do well, but Bitcoin may continue to rise if the momentum continues.

Bitcoin price at 80-90k: These levels are strong signals that the market is in a major bull run, but it is important to note that many investors may start taking profits, which could lead to a sudden correction.

Bitcoin price at 100k: This price may form a major psychological barrier, and investors are likely to start exiting the market to take profits. Altcoins may see strong gains, but they may also face a correction if Bitcoin starts to decline.

2. Monitor Bitcoin’s performance against altcoins: Altcoins usually rise strongly when Bitcoin hits certain highs and then stabilize or start to decline. When Bitcoin starts to make higher highs and you notice a slowdown or stabilization, this could be a sign that altcoins are gaining value. If you notice Bitcoin’s strength declining after hitting 90k or 100k levels, it might be a good time to exit altcoins.

3. RSI and Volume Analysis: If Bitcoin’s RSI shows that it is in the overbought zone at $80-100k, there may be a correction coming soon. It is better to watch altcoins at this time because they usually move strongly during this period, but may correct violently afterwards.

4. Timing of altcoins exit:

Altcoins usually perform well after Bitcoin hits new highs. However, if Bitcoin starts to decline, it could lead to a rapid decline in altcoins. If Bitcoin is approaching psychological highs (such as 90k or 100k), it might be wise to start gradually taking profits from altcoins.

My suggestion:

At $70-80k: Watch carefully and be prepared to gradually exit if you start to notice Bitcoin losing momentum.

At $90-100K: If altcoins reach new highs at this time, it might be better to consider taking profits, especially if market indicators indicate a possible correction.

Above $100k: This is an untested area and can be very volatile. It is best to be very careful here because corrections in this area can be very violent.

Risk management is key in this type of market.