Didnt allocate disk space

Hi,

I forgot allocate my disk space after the installation of UBUNTU LTS 20.04.

Now my disk is already full. I am running 3 webservices behind NGINX with postgreSQL.

Is there a way to allocate the remaining disk space to the same partition?

I think postgreSQL is writing to /dev/sda2 but i also have a /dev/sda1 and /dev/sda3.

I tried to work with "fdisk" but in the middle of sda2 and the open bytes is sda3. And I guess i just cannot delete 3 and realocate everything to 2?

Any help is greatly appreciated (also in German)

Thanks in advance,

Mike

I already followed a guide on the internet but i am stuck at this point now:

I reallocated the storage via fdisk and rebooted but dont know how to reallocate it logically (see picture)

thank you!
worked like a charm