Sorry, but if you spend a little more time explaining your strategy and less time writing shit, maybe we could all help you and give some actual advice? First of all, you gain a level each turn as long as you have 4 cards of a type in either your hand, the backline, or combined. Second, you don't have to junk 10 cards, at most spend 2 or 3 turns to gain a level. Third, literally every type has a leveling card that now increases your level by 3, instead of previous 1. Add that to the increase of 1 level at the beginning of a turn, and you are literally gaining possible 4 levels in 1 turn. In addition, many cards have now been modified to also increase a level, such as energisation in electric. Fourth, the psychic type has a play on draw card called flash of genious. This card is automatically played as soon as it is drawn and increases your level by 1. This card also goes to the exile as soon as it's played, meaning that with another psychic card called souvenir, you can recover two of them and gain two more levels.
After playing a lot with this new system, noone can say it's slower. With the ideal combination of cards, it's literally possible to play sky attack in the 6th or even 5th turn. Also, it's important to keep in mind that your level stays and never drops, so say you put a psychic card you can junk, you can use pretty much anything psychic that's level 2. This gives great possibilities to dual type decks, for example it's now much easier to add energetic mining to almost any special deck since it's not nearly as hard to maintain the ground level without adding too many ground cards.
I will say it again, we had many more major modifications than this. If you have played the battle mode for a longer period, you will remember that when support cards were added, you literally had to go and modify every single team deck, and even some individual ones that relied on the cards that were modified to become support cards. Same happened when the simbols were introduced, you had to add them to almost every dual type deck because it made leveling a lot easier.