linux - Server performance affected by MySQL memory consuption and CPU usage

Everyday during the peak time my server getting slow or down. Our hosting provider insisting us to upgrade the server but I think some performance tuning issue is there.

Adding the process information, server configuration and my.cnf parameters below.

Process Information

 PID  USER       PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                  

 60848 mysql     20   0 34.8g  23g 6416 S 2196.2 82.1  16027:29 mysqld

Dedicated Server Configuration

Size:   'Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz', 2600MHz, 6 Core, Sockets: 2    
Image:  CentOS 6 64-bit with cPanel Fully-managed   
CPU:    Intel Dual Xeon E5-2620 v3
Speed:  2600MHz 
RAM:    32067MB 

CPUs:   2 Physical CPUs
Cores:  12 
Total Cores RAID:   Level 10
Disks:  4
Size:   917GB   
Type:   SSD

MySQL Configuration

[mysqld]
slow_query_log = 1
#long_query_time = 2
long_query_time = 2
slow_query_log_file = /var/lib/mysql/vps-slow.log
performance-schema=0
max_connections = 250
max_allowed_packet=128M
#skip-external-locking
key_buffer_size = 256M

open_files_limit = 50000
table_open_cache = 15000
sort_buffer_size = 6M
join_buffer_size = 6M
read_buffer_size = 1M
read_rnd_buffer_size = 15M
myisam_sort_buffer_size = 64M
query_cache_type=1
query_cache_limit=2M
query_cache_size=128M

max_heap_table_size = 96M
tmp_table_size = 96M
#low_priority_updates=1

thread_cache_size = 32
wait_timeout = 300
connect_timeout=15
interactive_timeout = 800

innodb_buffer_pool_size=4096M

innodb_buffer_pool_instances = 4

group_concat_max_len=1000000

default-storage-engine=MyISAM
innodb_file_per_table=1

[mysqldump]
quick

Please help me if there is anything wrong with the configuration ?

Do I really need to upgrade the server ?

PS: Hosted web application in the same server. Also WHM enabled for easy management.

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