Heads-up for Fortnite account going from PS4 to Switch (not sure about Xbox). You can't so you'll be forced to either buy another battle pass or just not play it on switch.
Here's A Graphics Comparison Of Fortnite On Switch, PS4, And PS4 Pro - NintendoSoup
:no_upscale()/cdn.vox-cdn.com/uploads/chorus_asset/file/13170903/Screen_Shot_2018_09_27_at_1.31.31_PM.png "How to tie a PlayStation-linked Fortnite account to your Nintendo Switch - The Verge")
How to tie a PlayStation-linked Fortnite account to your Nintendo Switch - The Verge
Fortnite' Account Merge Guide: How to Transfer V-Bucks Between PS4, Xbox & Switch
How to Log Out of Fortnite on the Switch | Fortnite
How To Finally Merge Your Xbox, Switch And PS4 'Fortnite' Accounts Together
/cdn.vox-cdn.com/uploads/chorus_image/image/60035329/ukbmAPj.1528821148.jpg "Sony is blocking Fortnite cross-play between PS4 and Nintendo Switch players - The Verge")
Sony is blocking Fortnite cross-play between PS4 and Nintendo Switch players - The Verge
How to Log Out of a Fortnite Account on PS4 | Digital Trends
Read description)Renegade Raider-Purple Skull-Wildcat exclusive+300More | eBay | Fortnite, Raiders, Ebay
How to Connect Nintendo Switch to ANY Fortnite Epic Account (Xbox, iPhone, PS4, Android) - YouTube
How to SIGN OUT OF FORTNITE ON PS4 (EASY METHOD) - YouTube
Hey, Sony, it would be really cool to have my epic account unlocked for switch and be able to enjoy my money spent on the battle-pass : r/PS4
Fortnite's Account Merge Tool Transfers PS4 Unlocks to Xbox and Switch
Here's how to attach your PlayStation 4 Fortnite account to Nintendo Switch
How to merge Fortnite accounts on PS4, Xbox One, and Nintendo Switch | TechnoBuffalo
Fortnite: How To Link Your Epic Account On Each Platform
Link Fortnite Account To Nintendo Switch - YouTube
How to Log Out of a Fortnite Account on PS4 | Digital Trends
Fortnite won't support cross-play between Nintendo Switch and PS4 | TechCrunch
Fortnite account merge finally allows Xbox, PS4 and Nintendo Switch players to rescue V-bucks and skins | The Independent | The Independent
:no_upscale()/cdn.vox-cdn.com/uploads/chorus_asset/file/11524543/Pac_Man_Screen_Shot_6_12_18__1.14_PM.png "PS4 and Switch Fortnite accounts lock each other out, players furious - Polygon")
PS4 and Switch Fortnite accounts lock each other out, players furious - Polygon
How to Log Out of a Fortnite Account on PS4 | Digital Trends
USING MY "PS4 FORTNITE ACCOUNT ON THE NINTENDO SWITCH"- NEW! CROSSPLAY IS OUT NOW - PS4 AND SWITCH! - YouTube
How To Merge Your Fortnite Accounts On PS4, Xbox One And Nintendo Switch
/cdn.vox-cdn.com/uploads/chorus_image/image/60195435/fortniteswitchstock.0.jpg "Sony 'confident' it'll find a Fortnite cross-play solution - The Verge")
Sony 'confident' it'll find a Fortnite cross-play solution - The Verge
/cdn.vox-cdn.com/uploads/chorus_image/image/61551777/fortnite_on_switch_2400.0.jpg "PS4-locked Fortnite accounts now freed for Switch and Xbox One, merged accounts coming - Polygon")
PS4-locked Fortnite accounts now freed for Switch and Xbox One, merged accounts coming - Polygon
Fortnite Switch, PS4 cross-play update - Why won't Sony allow cross-platform skins? | Gaming | Entertainment | Express.co.uk
How to Fortnite cross-play on PS4, Xbox One, PC, Switch, iOS, and Android | VG247
/cdn.vox-cdn.com/uploads/chorus_asset/file/11525769/nintendoswitchfortnite.jpg "Fortnite fans are furious at Sony for ruining their handheld dreams - The Verge")
Fortnite fans are furious at Sony for ruining their handheld dreams - The Verge
/how-to-unlink-your-epic-games-account-website-fbf1f4bb94d2463fa1f6f860c2546456.jpg "How to Unlink Your Epic Games Account")