How to load all of my game object into another level?,How to load all previose levels game object and other object in new level. I am new to game dvelopment..please help?

I am bulding a flappy bird like game.It works fine.Now i want to level up my game.And i created a new scene.My question is how to add all the first scene object in my new scene?

Just try DontyDestroyOnLoad()

also try playerprefs

to keep all settings similar to previous level.