How can we create TCP connection with a droplet more than 2000

Iam not able to create TCP(MQTT) connections above 50K with EMQX on a droplet. It is a Ubuntu 22.04 (LTS) x64, Can any one help fix this VM.

I have configured the droplet with the following:

sysctl -w net.ipv4.tcp_max_tw_buckets=1048576
sysctl -w net.ipv4.tcp_fin_timeout=30
sysctl -w net.core.netdev_max_backlog=16384
sysctl -w net.core.rmem_default=262144
sysctl -w net.core.wmem_default=262144
sysctl -w net.core.rmem_max=16777216
sysctl -w net.core.wmem_max=16777216
sysctl -w net.core.optmem_max=16777216
sysctl -w net.ipv4.ip_local_port_range="1024 65534"
sysctl -w fs.file-max=2097152
sysctl -w fs.nr_open=2097152
sysctl -w net.core.somaxconn=32768
sysctl -w net.ipv4.tcp_max_syn_backlog=16384
sysctl -w net.ipv4.tcp_rmem='1024 4096 16777216'
sysctl -w net.ipv4.tcp_wmem='1024 4096 16777216'
sysctl net.ipv4.netfilter.ip_conntrack_max
sysctl -w net.ipv4.netfilter.ip_conntrack_max=1048576
sysctl -w net.core.netdev_max_backlog=200000
sysctl -w net.ipv4.tcp_max_syn_backlog=200000

Configured files

1. /etc/sysctl.conf

fs.file-max = 262144
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 12582912 16777216
net.ipv4.tcp_wmem = 4096 12582912 16777216
net.ipv4.ip_local_port_range = 1024 65534
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 4096
net.core.somaxconn = 8192
net.ipv4.tcp_fin_timeout = 30
net.core.netdev_max_backlog = 200000
net.ipv4.tcp_max_syn_backlog = 204800
net.core.netdev_max_backlog = 5000
net.netfilter.nf_conntrack_max = 1048576
net.nf_conntrack_max = 1048576

2. /etc/security/limits.conf

*      soft   nofile      262144
*      hard   nofile      262144
*      soft   nproc       65535
*      hard   nproc       65535
root    hard   nofile      500000
root    soft   nofile      500000

3. /etc/systemd/system.conf

DefaultLimitNOFILE=262144