How to reduce excessive snowballing

Lethality currently scales based on your level so it's not too OP to basically do true damage early on when champs don't have many items

Some other stats however are guilty of this overbearing power early on Crit damage: luck out on a crit and BOOM 1/3 of your HP gone when an ADC has 1 AD item and 1 crit item Mana: lower mana cost on earlier spell ranks yet huge mana regen runes and mana pools. Spam for days on every wave and still have more Attack Damage: some champs have ridiculous ratios while others do monstrous amount of damage with autos where you get instagibbed in 2-3 autos or blown up in 1 rotation after just getting a single completed item

Make these (especially crit damage) scale with levels too to reduce the overwhelming power of early game damage and ability spamming.