How exactly do I go about changing my mirror?

Hi, here's the info you requested, thanks!

sudo pacman -Syy
Password: 
:: Synchronizing package databases...
error: failed retrieving file 'core.db' from mirrors.fossho.st : The requested URL returned error: 503
 core                   52.2 KiB   127 KiB/s 00:00 [---------------------] 100%
error: failed retrieving file 'main.db' from mirrors.fossho.st : The requested URL returned error: 503
 main                  195.3 KiB   473 KiB/s 00:00 [---------------------] 100%
error: failed retrieving file 'apps.db' from mirrors.fossho.st : The requested URL returned error: 503


/etc/pacman.d/mirrorlist

#
# KaOS repository mirrorlist
#

# Default mirror
# United Kingdom
Server = https://mirrors.fossho.st/kaos/$repo

# Germany
Server = http://mirrors.redcorelinux.org/kaosx/$repo
Server = http://mirror6.layerjet.com/kaos/$repo
Server = https://mirror.alpix.eu/kaos/$repo

# Canada
Server = https://ca.kaosx.cf/$repo

# China
Server = https://mirrors.tuna.tsinghua.edu.cn/KaOS/$repo
Server = https://mirrors.nju.edu.cn/kaos/$repo
Server = http://mirrors.nju.edu.cn/kaos/$repo
Server = https://mirrors.aliyun.com/KaOS/$repo
Server = http://mirrors.aliyun.com/KaOS/$repo

# Czech Republic
Server = http://mirror.234.cz/kaos/$repo

# France
Server = https://fr.kaosx.cf/$repo
Server = http://kaos.youm.org/$repo

# Netherlands
Server = https://mirror.easylee.nl/kaos/$repo
Server = http://mirror.easylee.nl/kaos/$repo
Server = https://repo.kaosx.us/$repo

# United States
Server = https://mirror.math.princeton.edu/pub/kaoslinux/$repo
Server = http://mirror.dacentec.com/kaosx/$repo
Server = http://kaosx.tk/repo/$repo
Server = https://kqtos.tk/repo/$repo


# Vietnam
Server = https://mirror.freedif.org/KaOS/$repo




#
# /etc/pacman.conf
#
# See the pacman.conf(5) manpage for option and repository directives

#
# GENERAL OPTIONS
#
[options]
# The following paths are commented out with their default values listed.
# If you wish to use different paths, uncomment and update the paths.
#RootDir     = /
#DBPath      = /var/lib/pacman/
#CacheDir    = /var/cache/pacman/pkg/
#LogFile     = /var/log/pacman.log
#HookDir     = /etc/pacman.d/hooks/
HoldPkg     = pacman glibc
#XferCommand = /usr/bin/wget --passive-ftp -c -O %o %u
#XferCommand = /usr/bin/curl -L -C - -f -o %o %u
#CleanMethod = KeepInstalled
Architecture = auto

# Pacman won't upgrade packages listed in IgnorePkg and members of IgnoreGroup
#IgnorePkg   =
#IgnoreGroup =

#NoUpgrade   =
#NoExtract   =

# Misc options (all disabled by default)
#UseSyslog
#ShowSize
Color
#TotalDownload
CheckSpace
VerbosePkgLists
ILoveCandy

# By default, pacman accepts packages signed by keys that its local keyring
# trusts (see pacman-key and its man page), as well as unsigned packages.
SigLevel = Never
LocalFileSigLevel = Never
#RemoteFileSigLevel = Required

#
# REPOSITORIES
#   - can be defined here or included from another file
#   - pacman will search repositories in the order defined here
#   - local/custom mirrors can be added here or in separate files
#   - repositories listed first will take precedence when packages
#     have identical names, regardless of version number
#   - URLs will have $repo replaced by the name of the current repo
#   - URLs will have $arch replaced by the name of the architecture
#
# Repository entries are of the format:
#       [repo-name]
#       Server = ServerName
#       Include = IncludePath
#
# The header [repo-name] is crucial - it must be present and
# uncommented to enable the repo.
#

[core]
Include = /etc/pacman.d/mirrorlist

[main]
Include = /etc/pacman.d/mirrorlist

[apps]
Include = /etc/pacman.d/mirrorlist

# An example of a custom package repository.  See the pacman manpage for
# tips on creating your own repositories.
#[custom]
#Server = file:///home/custompkgs  ```

demm Ok great I'll just do a regular Syu update then, thanks a lot for all your help!!