I suspect that your club has now got the infrastructure to be able to compete comfortably at the next level and perhaps beyond where expenses etc increase substantially.
The question is, is that where you want to be?
Your recruitment area is not large, so unless you can start churning out colts etc who can play at the next level, your recruitment costs will increase.
Its difficult one really, those club players who are on the cusp of the first team now, who can step up and help if required, will not be able to do that if you go up a couple of leagues, so they will seek their level rugby at Y1 clubs etc. elsewhere. That means you end up with a 1st team squad and maybe a a couple of vets teams or similar.
When you look at a lot of the teams in N2N they all seem to struggle to put out 2 or more sides. everything is sacrificed for the benefit of their first teams, which regrettably includes funding for lower adult sides.
Harrogate is a good example, in the 70's and 80's, they could put out six adult sides, as did Otley, Roundhay etc. Now they are struggling to put out a second team on occasions.
They have/had a buoyant youth section which has indirectly funded the first 15, so where have all those players gone? some lost to rugby totally, I suspect.
So as Scarborough look to climb the leagues, they might want to reflect on what has provided the platform to fund their ambition and learn from the mistakes of others.