How to optimize more?

Question

I just uplouded the base of a 3D fantasy game. I,m planning on adding many things, but i don't know if i will be able to keep it performative as i want it to. I,m looking for some advices. I,m already using a system that decreases the level of detail of distances and it only checks for colliders nearby. I wonder if there are some techniques i don't know about. Your opinions are important.
https://sololearn.com/compiler-playground/W2oaA6H5K36b/?ref=app