How can I increase /boot partition

I'm not sure why but when installing cPanel it seems only 200MB was allocated to /boot so I need to either shrink and extend the current partitions or better I have added extended the drive and have free space (/dev/loop0) I also have added a second drive I could also use (/dev/sdb) how can I use either to extend /boot parition? df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 24G 0 24G 0% /dev tmpfs 24G 4.0K 24G 1% /dev/shm tmpfs 24G 33M 24G 1% /run tmpfs 24G 0 24G 0% /sys/fs/cgroup /dev/sda2 414G 115G 278G 30% / /dev/sda1 227M 179M 33M 85% /boot /dev/loop0 3.9G 31M 3.6G 1% /tmp tmpfs 4.8G 0 4.8G 0% /run/user/0
fdisk -l Disk /dev/sda: 488.6 GB, 488552529920 bytes, 954204160 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x0009d882 Device Boot Start End Blocks Id System /dev/sda1 * 2048 489471 243712 83 Linux /dev/sda2 489472 881219583 440365056 83 Linux /dev/sda3 881219584 943718399 31249408 82 Linux swap / Solaris Disk /dev/loop0: 4294 MB, 4294967296 bytes, 8388608 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/sdb: 5368 MB, 5368709120 bytes, 10485760 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
losetup -a /dev/loop0: [2050]:24122515 (/usr/tmpDSK)
/etc/fstab UUID=b551a04e-f1e6-40f0-850e-470bcdf58a23 / ext4 usrjquota=quota.user,jqfmt=vfsv1 1 1 UUID=2a14690d-e9d7-4d67-9e97-e7aab5d36a8f /boot ext4 defaults 1 2 UUID=5ca0c34b-1ca2-4e38-9720-61995cc88c42 swap swap defaults 0 0 /usr/tmpDSK /tmp ext3 defaults,noauto 0 0