Size of projects

Hello everyone, I have been working on a huge project, since several month. I have reached 222 MB project when published, and I am far from being finished yet. I have used, Draco compression (50%) and Basis for unimportant textures, I have limited the size of the textures to 512 max in most cases, and finally I have batched every static stuff, as often as possible. Still the full project take already a little while to load when launched. Are there any way to speed up the launching (for instance is it possible to load only actual scene, instead of the entire project? ) ?
Thanks for your future advices

remove the unuseful fbx files (source) you gain space…a lot

I may do so but for the moment i keep them, because I am using draco at 50% compress rate, and if I decide to go for more, I will need to reimport all the assets, with the fbx file.

Thanks for your comments, I have made the corresponding adjustements, especially, uncheck the useless preload assets and kept the important ones. The result is quite impressive. first time load take few seconds, but later game starts are instantaneous.