I feel like the name [name_f]Nola[/name_f] isn’t complete and I’m looking for a long form of it.
I actually think [name_f]Nola[/name_f] is fine but the only longer form I can think of is [name_f]Magnolia[/name_f].
[name_f]Penelope[/name_f]
[name_f]Josephine[/name_f]
[name_f]Eleanor[/name_f]
[name_f]Lenora[/name_f]
[name_f]Noelle[/name_f]
Maybe not exactly what you were looking for… I think these are names that [name_f]Nola[/name_f] would work for as a nn
I love [name_f]Magnolia[/name_f] nn [name_f]Nola[/name_f]/[name_u]Noli[/name_u]. 
[name_f]Nola[/name_f] is a full name. I don’t understand what users mean when they say the name does not feel complete.
Gwenola, [name_f]Wynola[/name_f] ([name_f]Winola[/name_f]?).
Nolette, [name_u]Nicola[/name_u], [name_f]Nicolette[/name_f].
My favourite longer forms are [name_f]Penelope[/name_f], [name_u]Nicola[/name_u], [name_f]Nicolette[/name_f], [name_f]Leonora[/name_f], [name_f]Eleanor[/name_f].
[name_f]Anna[/name_f]-[name_f]Louisa[/name_f], [name_f]Agnola[/name_f], [name_f]Anabella[/name_f], [name_f]Antonella[/name_f]
[name_f]Cornelia[/name_f], [name_u]Connelly[/name_u], Coronella
[name_f]Eleanora[/name_f], Elsinor
[name_f]Finola[/name_f], [name_f]Fionola[/name_f]
[name_f]Gwennola[/name_f]
[name_f]Hannelore[/name_f]
[name_f]Leona[/name_f], [name_f]Leonora[/name_f], [name_u]London[/name_u]
[name_f]Nicolette[/name_f], [name_f]Noelle[/name_f], [name_f]Nicole[/name_f]/[name_u]Nicola[/name_u], [name_f]Nicolina[/name_f], [name_f]Natalia[/name_f], [name_f]Novalie[/name_f], [name_m]Nolan[/name_m], [name_f]Nolana[/name_f], [name_f]Nolita[/name_f], [name_f]Nolwyn[/name_f], [name_f]Noelani[/name_f], [name_f]Noeline[/name_f], [name_f]Norabel[/name_f], [name_f]Norlene[/name_f], Norilynn, [name_f]Novella[/name_f]
You could also try a first name/middle name combo like [name_f]Norah[/name_f] [name_f]Lily[/name_f], [name_f]Naomi[/name_f] [name_f]Lucine[/name_f], [name_f]Norma[/name_f] [name_u]Lee[/name_u] or [name_u]Nelly[/name_u] [name_f]Olivia[/name_f].