We don't know when altcoin season will end, altcoin season has just started. I just hope the altcoin season can last longer. For this reason, it's very important to monitor the market during this bullrun, lest you not take profit at this moment.
None knows about that and it's clueless to talk about something that the answer will be random. It can be predicted based on the trend of bitcoin and ethereum.
Bitcoin almost reaching new ATH and ethereum has broken the new ATH again. that proves if altcoin season is still on the way. this trend may be ending next year.
Bitcoin is very stable and some big parties have planned to offer bitcoin-related service. Ethereum will be also getting a lot of big news as well.