What are examples of street tier characters getting big amps in power?

It doesn't matter how powerful as long as it's a significant boost from their regular power.

Odysseus getting Jericho's power

Kangaroo II getting steroids

Mysterio getting the Crimson Mark

Taskmaster not jobbing

Yikes.

Cap being Worthy Cap?

Spiderman getting the Uni Power

Amadeus Cho turn into a Hulk

Batman getting the Mobius Chair or Lantern Rings

Lex Luthor turning into Apex Lex

Joker getting Mxy powers

Cosmic Ghost Rider = Punisher + Spirit of Vengeance + Power Cosmic.

Well I know that the Punisher had angelic powers for a time and they did turn him into FrankenCastle a couple of years back. Do those count?

Infinity Gauntlet Black Panther

Batman with any lantern ring.

MCU Cap with Mjolnir

Wolverine with Phoenix-force.

Punisher with Spirit of Vengeance + the Power Cosmic.

deathstroke with ikon suit and godkiller

cw arrow as the spectre

elaine belloc becoming the presence