Yikes,  I don't know where to start.

1. You should not be doing NM campaign at all

2. You should be farming 12.3 brutal

3. You don't need legendary heroes, some rares are just as good and can help you 

4. You have a dug a pretty big hole. Who do you have at 50?

A screenshot of your roster would help

gabeperron11 said:

Hey guys i feel like the only really way to progress from the mid-game is to get legendary heroes and so far after 3 months of playing around 1-2 hours per day i find it difficult to progress.

I know this may sound a little harsh, but i think there is a saying in English like that "You get what you give". If you are F2P like myself, you have to understand, that your primary currency in Raid is your time. There is no such thing as completely F2P.  If you are not willing to spend money, you still have to invest something. And that is your time.

And by that i don't mean just clicking some buttons, running some battles, upgrade some gear and and just doing regular game stuff in game. You have to invest time to research more info, time to read guides, time to watch related videos, time to prepare for events, tournaments, fusion.

Time is our currency the same way money is for those that pay for stuff. Your progress is related to how time you are willing (or can) invest in Raid. Answer this to yourself and you will know exactly how far and how fast you can progress.

heres 3 pages of my top heroes.

Surely when you look at other teams in arena, you see champions that you have too? No idea why you say you don't have PVP champions. Tons and tons of teams in silver use Kael, Spirithost, Elhain, High Khatun. You'll also see some Sepulcher Sentinels, Luas, Gala Longbraids. The only thing I'm not immediately seeing in your roster is a champion who could do AOE decrease defense, but you could easily get a Warmaiden from campaign. 

In general, you seem to have really a lot of level 40s, many of them fully ascended, including a bunch of uncommons for some reason... You've been spreading your resources over too many champions, you could already have a few more level 60s by now if you had been more efficient. 

You don't need legendaries to progress further, but you do need to take your best epics and rares to level 60, and to ensure they have the right gear. Whatever you may think about the recent Dragon tournament that required you to use only Rare champions, it certainly showed that it's entirely possible to run dragon stage 20 with a team of only rares, if you choose the right ones, with the right gear and tactics. 

Looking at your Peydma, she needs more accuracy and speed especially. And she won't be at her best with that shield set.