"We have got to keep improving in the three facets of the game and be clinical and lot more consistent," said Holder, who missed the game in St Lucia through suspension for a slow over-rate.
"Our bowlers have done an outstanding job. It is up to our batsmen to contribute more.
"We need to continue to build and not rest on our laurels. Our number one goal is to be the number one team in the world so there is a lot to improve on."
The West Indies have been a shadow of the side which totally dominated world cricket for much of the 1970s and 80s, and after years of struggles, sit eighth in the current ICC rankings, ahead of only Bangladesh and Zimbabwe.
The Caribbean outfit do not play a Test until after the World Cup, which finishes in July, with a five-match one-day international series against England next on the agenda.
"I had a chat with Roston before his innings," said Holder.
"He was a little disheartened with his dismissals in this series so it is good to see him knuckle down and get some runs, especially in the context of the day. It would have been easy for us to be rolled over."
- Questions for England -
England salvaged some pride and confidence in St Lucia, with Mark Wood's fiery spell which saw him take a maiden Test five-wicket haul in the first innings a high point.
"The early-season Championship matches will play a big role for those at the top. If they score a lot of runs early season it will go a long way to helping them play in that first Ashes Test.
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