I theory yes you can get to genetic peak via a cycle and keep it but in practice it’s a different story. You have to have the discipline nutrition and regiment down to keep it but if you have that you can just get there naturally without it.
Now I don’t know if you meant this or not but I got the feeling you were saying a cycle of only anavar. This is a horrible idea. All steroids suppress natural testosterone production so if you only take anavar you will be trying to build muscle in a low to no testosterone state. Our bodies need test. If you are a female you can get away with only anavar because of how female bodies make their little bit of test.
You could technically use HCG to keep your natural test production on during an only anavar cycle but then you run into the whole 75% of the “anavar” out there isn’t anavar. If it is actually an anabolic then it is usually winstrol or winstrol mixed with dbol.
The only way an oral only cycle could work would be with HCG but by the time you get everything even if you use dbol or winstrol(two of the most affordable orals) then you will probably spend 2-3 times what a simple bottle of testosterone costs. You still have to run a PCT either way. I guarantee you that bottle of testosterone will get you a check of a lot more bang for your buck vs orals and HCG.
Really the only time you should think about or use steroids is to get past a wall, weather it’s genetic limit or a strength barrier.