A +1 modifier in everything is pretty much the worst way to go. To say that by trying to do everything you'll be good at nothing is an understatement. You'll be weak at everything, failing a ton of rolls and when something does land it will do very little. Forget about trying to play every class at the same time, it's not going to work or be good. Specialize at a couple of things and stick to those. A high damage dealing tank barbarian, a powerful wizard with a lot of utility spells, a high damage warlock with the charisma to twist the minds of everyone around, etc. Trying to chase this omniclass build is a fool's errand.
