Most of the market is beginning to pick up in recent times and altcoin look left behind in the recent market boom.
What are we going to expect from the altcoin market with this new market boom will altcoin see a new phase in the market or Bitcoin will continue with the market trend?
When you say most of the market, that simply means that there is already an altcoin included on it because the market is composed mostly of altcoins if not tokens and there is only one bitcoin. You need to be specific and say the name of that altcoin that have been left behind in the recent boom because most of the top altcoins are performing better now together with their master bitcoin.
When btc is rising, we can expect that altcoins will do the same thing but they can't cross over bitcoin. It should be btc that must first take the lead before them. They need to give way to the king. In terms of a new altcoin, a new altcoin can always boom but that can be for short term only.
The three that I could clearly see is XRP, BCH, BSV. Remember that these were all high level coins, two of them top 10 at one point and not out of sight, XRP is not doing horrible but at the same time it is not doing that bad neither. So, we have seen all these three not do well during the 2020-2021 bull run, and not doing that great right now neither.
I am not so sure if you would be interested in that or consider that as "left behind" but there are certainly some projects that go up with the bull run, go down during the bear run and never come back up no matter how much you try. These were done after the 2018 bear run and will stay that way forever most probably.