How to randomize a stages with no repetition?

So im making a 2D game which i need to random between stages ( functions ) , i want it to be something like that , (1,3,4,2,1,4,2,3,1,2,4,3,1,2,3,4.... and so on) ( each number is stage not a real integer)

thats the way the stages go now :

   if (Score > 10 && Score < 20)//stage 2
             {
                 TextGame(spawnedObject);
             }
             if (Score > 20 && Score < 30)//stage 3
             {
                 ColorGame(spawnedObject);
             }
             if (Score > 30 && Score < 40)//stage 4
             {
                 NumberGame(spawnedObject);
                 Invoke("NormalGame", 10);
             }
            
             if (Score > 40 && Score < 50)//stage 1
             {
                 NormalGame(spawnedObject);
                 
             }
             if (Score > 50 && Score < 60)//stage 2
             {
                 TextGame(spawnedObject);
             }
             if (Score > 60 && Score < 70)//stage 4
             {
                 NumberGame(spawnedObject);
                 Invoke("NormalGame", 10);
             }
             
             if (Score > 70 && Score < 80)//stage 3
             {
                 ColorGame(spawnedObject);
             }
             //stage 1

but i want it to be endless , any help would be really appriciated, ive tried many MANY stuff and none has worked.