Bognor manager Jack Pearce is demanding a top half finish after his side got the win they needed to ensure safety.
The Rocks beat already-relegated Redbridge 4-1 at Nyewood Lane to go 11th in Conference south.
First-half goals from Matt Russell and Kevin Murphy put the hosts in control, before Hector Mackie gave Redbridge brief hope on 52 minutes.
Top scorer Luke Nightingale restored the two-goal advantage just two minutes later and Richard Hudson rounded things off with a superb free-kick.
Pearce said: "It is a relief to get the result which means we are definitely safe and now I want to finish the season on a high.
"We have been in or around the top half for most of the season so I don't want to drop out of it now.
"I have set the players a target of six points from our remaining games which should be good enough to do it. I would consider it a very good season if we managed it."
Lewes were punished for not taking their chances in a 1-0 defeat at relegation-threatened Maidenhead.
Barrington Belgrave twice had efforts saved by keeper Nick Federici in the second half and the custodian also made a point-blank stop to keep out Lee Newman.
Craig O'Connor hit the winner on 74 minutes to take Maidenhead out of the bottom three.
Defeat saw Lewes drop to fifth and leaves them with just one league win from their last nine games.
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