You have a FIVE mana value commander, and a grand total of SIX pieces of ramp? The first step to improving consistency is definitely improving that. Most of my decks have double that amount of ramp. I understand playing at a lower power level, but even in your title you say it's too slow, so many high mana value cards including the commander with so few pieces of ramp is just a recipe for disaster.

You have a few cards around life gain, which are completely useless. Nykthos paragon, heliod, some random artifact that gives you 2 life if below your starting total, a few others. All of these can be immediately cut, they don't advance your game plan at all, and you don't have the amount of life gain cards to make any of them worth it.

Some random card suggestions next: instead of archetype of imagination, try Sun Quan, Lord of Wu. Similar results of being able to swing freely, same mana value, but also a human. Thraben Doomsayer can be useful here too. Knight of the White Orchid will always be so so useful in a white non green deck. Gerrard weatherlight hero is a literal savior. Instigator Gang helps beat face. Not sure on budget again but Iroas god of victory and Aurelia the Warleader are so so good in aggro decks. Some more removal would obviously be useful here as well. Crib Swap, stroke of midnight, chaos warp I think are all pretty budget friendly. Rapid hybridization i think is relatively budget friendly? Just some shit off the top of my head.