Seems to me like you need better card draw? Or more slivers compared to the number of other things in your deck. Your land count also seems a little high - I usually go with around 36. Jodah, Archmage Eternal is similar to Fist of the Suns

Thank you for your tips. Jodah looks perfect for 5colors. I think I can get 2 or 3 lands out, im always scared that I dont have 5 colors at turn 5/6. For better draw i can think of [Distant Melody], are there some got multi color card draws?

I don't agree about Jodah, Archmage Eternal or Fist of Suns. I think both of those cards actually hurt your deck instead of help it. Your mana costs are not high enough for replacing them with WUBRG. Neither of those cards brings what Morophon, the Boundless does to the table. I would dump Fist of Suns for Fellwar Stone or something like Cryptolith Rite. Even Birds of Paradise or something similar is a way better card for this deck than either of those. I would dump Winged Boots for Lightning Greaves. Haste is better than flying and shroud is better than ward.

You have way too few slivers in your deck to "Swarm" anyone. Let alone a table full of opponents. Your deck also has a lot of cards that are targeted creature removal. I would dump a lot of that removal for adding quality slivers that provide removal or create removal for you. Take a hard look at your sorceries and instants and see if there is a sliver that does the same thing. Then replace that card with the appropriate sliver. You also need more card advantage to refill your hand once you start slamming slivers down. You can combo using your mana slivers, Intruder Alarm and cards like Vanquisher's Banner. With those cards in play, every time you cast a sliver you will draw a card and untap your slivers which can let you chain through your library in no time.

For more card advantage and more slivers I would suggest the looking to add some of the following depending on your budget; Herald's Horn, Icon of Ancestry, Cryptic Gateway, Descendants' Path, Guardian Project, Kindred Discovery, and The Great Henge. Since you don't have Sliver Queen you can make more slivers with Maskwood Nexus or Birthing Boughs. Realmwalker is another great card. Adding 4-6 of some of these will really speed your deck up.

Good slivers to replace sorceries, instants or land you take out:

Necrotic Sliver, Essence Sliver, Two-Headed Sliver, Fury Sliver, Belligerent Sliver, Galerider Sliver, Bonescythe Sliver, Venom Sliver, Syphon Sliver, Diffusion Sliver, Hibernation Sliver, Brood Sliver, Crypt Sliver, Blur Sliver, Opaline Sliver, Toxin Sliver, Tempered Sliver.

You don't have to use all of these but some of them are insanely good like Necrotic Sliver. You don't need any removal spells if you have a bunch of slivers and this one in play.

Add Aggravated Assault to your deck. Because your slivers also double as mana rocks, so long as you have 5 slivers on the field, the untapping component of Aggravated Assault will give you infinite combat steps. If you have 6 slivers on the field, will net you infinite mana, which you can use with your commander to tutor every sliver in your deck and cast them all.

If you have 6 slivers on the field and Amoeboid Changeling, you can get infinite mana, use the infinite untaps of Amoeboid to turn all of your opponents' creatures into Slivers, then use your commander to take control of all your opponents' creatures and kill them with the infinite combat steps you now have.