Everton's relegation fears deepened on Monday after losing 5-0 to Tottenham Hotspurs.
The defeat was Everton's 14th in their last 18 Premier League games.
The Toffees were down by three goals at halftime and shipped two more after the break, leaving them just one point and one place above the relegation zone.
Little has changed since Lampard replaced Rafael Benitez at the end of January but the former Chelsea boss has called for unity in the club's remaining matches.
"We have to think of the bigger picture, [there are] 13 games to go, for us, eight of those at home," Lampard told Sky Sports. "Teams around us are having difficulties but that's where we're at.
"Before I came in there were issues and they are becoming clearer, but it's important the positivity stays, but not stupid positivity, there's nothing positive about tonight apart from maybe Anthony Gordon.
"I have no problem with the challenge, I knew what it was, the general feeling has been very good and we can't lose that because people will throw things at us for one bad game.
"I had 20 years as a player. I had 50, 100 periods like this. Everything is relative. It is important you stick together and work hard.
"I am confident, [but] that doesn't mean anything. I didn't walk into the building with a magic wand.
"The feeling at this club when I came here was we could be going down, it was clear around the club and city, it was up to me to change that and I thought we had changed that, but this is a test of that.
"I can't wait for the next two games at Goodison. I will be ready for them, the players will be ready for them, they have to be ready for them."
