1. Lifestealing Abilities
Abilities that heal you a portion of the damage they dealt based on your lifesteal stat.
2. ManaStealing
Abilities that steal some of the enemies mana. Abilities that steal some of the enemies mana based on your lifesteal stat. Maybe a new genre of items that gives Manasteal.
3. Manaburn
Abilities that destroy a portion of the enemies mana.
4. More channeling abilities.
Like Anubis' Locusts Cone. Something that stuns an enemy and yourself on a support and stuff like that. They are cancelled by stuns, like Guan Yu's Assault.
5.Actual Size, as in heroes that are larger than others visualy (ymir > vamana) and have larger hitboxes.
6. Upgradable Passives. (Ability Passives)
Not sure why they aren't already implemented, but they need some abilities that have no active, every other mobas has them.
7. Minions That last more than 5s lol.
You should be able to micro manage minions by pressing the ability and zooming out to see the whole map, and select a place to send them or an enemy to attack. While you are zoomed out you continue in the direction you were heading. Also minions should mostly last around 25s - 60s.
8. Someone with different forms that they actually stay in.
Like you choose a form to turn into and you gain a different passive/abilities while in it and you stay in it until you choose to switch again.
9. Overall less simple abilities.
EX: Vamana, damage in cone. Apollo, Damage in line.
10. Gods with no mana
Pretty straight forward, they would generally have longer cooldowns and such, possible the abilities take health.
11. Toggle Abilities
As in, while you have it on, your AAs take mana but have an additional effect (bleeds, Piercing, slows, wtva). Sure we have xba but that is more about the additional damage than the side effect + we need more of them.
12. More exotic and relevant passives.
Lots of passives hardly have an effect on the gods play style and build (DONT GET ME WRONG, A LOT DO) but there could be more significant passives, like a god whos max CDR cap is increased to 60% (in a a patch like this there would have to be more cdr items released).
Also, another messed up thing in smite is that you loose your lead very fast if the enemies don't surrender. Increasing the max level to 25 and making it so with the spare levels you can upgrade you stats (like in dota) or make it so you can buy stats so that late game you can continue getting stronger (slower though).
Another thing in smite is late game, the assasins and hunters have a lot of burst but they die so incredibly fast. most assassins in smite are weaker late game which makes zero since, they are supposed to be weak early ggame and strong late game. The only assassin/hunter that is stronger late game is Mercury because his 1 scales hard making him very strong late game. The main reason this doesn't happen in other mobas is because almost all items have a small amount of Defenses and/or health built into them. Tank items obviously would have more, but this allows assassins and hunters to keep up the damage while still being tankier. So pretty much getting fed also means you are more durable.
Also in other mobas farming makes a bigger deal, so you can catch up with enemy carries by getting some solo farm. In smite that doesn't work.
ALSO:
Im fairly new to smite, I started at the beginning of this summer (no side jungles when i joined). But i saw a video of the map with side jungles and i thought it was really cool. Currently the solo lane can be boring at points, like when you are both really tanky and you know you can't hurt eachother so you just ignore eachother, adding the side jungles again could create fun little mini competitions every time they respawn, and whenever you kill the enemy soloer/ enemy in the duo your award could be the xp and the buff. I though that was rly cool so :P. Also i think the mid furies are way to important so: I know making a small camp would make the jungler have less gold and xp overall but the introduction of the side jungle buff would make another source of farm for the jungler to make up for the loss of the big mid camps. Im not sure how this would work, i dont know how the numbers would add up, its just an idea :3