Mettam, 29, has signed a two-year contract at The Walks and was unveiled to supporters at a packed fans’ forum on Tuesday night.
On his arrival at Lynn, Mettam said: “I’m 29 now and my will to win is probably my biggest asset, whether it is out here on a Saturday afternoon or if I’m at home playing Monopoly with my little boy.
“I know we’ve got a young squad here, but I’ve got experience at this level and I think I can help the youngsters.
“We are all here to do the same job and all need to be pulling in the same direction for the chairman and the gaffer.
“It’s all about lads putting in a shift as individuals and for each other. It’s about wanting to win for the club.”
The Lincoln-based frontman added: “I’m not going to predict things, but we all know what we are here to do.
“Hopefully in two years time we might be sitting pretty in the Conference North or South and be pushing for a play-off place to the Conference Premier.
“You only have to look around here, it’s a big club. It’s a bit of a hidden gem and all it needs is someone like the new chairman to take it by the scruff of the neck and try to take it places.
“If we start winning games and play attractive football, I don’t see why we can’t get a 1,000-plus people through the gate.”
The frontman enjoyed a spell in Lynn colours in January last year, on loan from Tamworth, and scored three goals in five games.
An injury-hit spell with the Lambs saw him net 11 goals in 35 appearances during a two-year stay with the Staffordshire-based outfit.
“I really enjoyed my month when I was with Tamworth and I came here to get some game time.
“A new chairman has come in and he was just as enthusiastic to bring me here as the gaffer was, so I’m looking forward to getting started.”
Mettam began his senior career at Lincoln City where he had spent three years as a youth player.
He won the Southern League with Corby Town and had a spell with Gainsborough Trinity, but it was during his Worksop Town days that he catapulted himself into the spotlight.
Mettam bagged 66 goals in 80 appearances, winning the Golden Boot in 2013-14, scoring 50 goals (all competitions) for the Tigers before being snapped up by Tamworth.
“Tamworth was a difficult two years for me,” admitted Mettam.
“I had a dislocated ankle, which wasn’t picked up for 12 weeks, a couple of hamstring injuries and then I did the medial ligament in my knee.
“The way I looked at it in the end is that certain players fit in at certain clubs.
“When I came here for that month I felt as though I fitted in and the fans were great to me, as they were at Tamworth. It’s a great feeling to be back.
“I don’t feel I have played since I was 27. I’ve got plenty in my legs and plenty in the tank.
“This is a new challenge and a new start for me.”