new member wanting to upgrade mk6 sri

[Mk101]

hi everyone 
new to the site and finding how to post a question nearly made me buy a new ipad lol 
i am looking to firstly change my suspension on my astra j sri 1.7 i think aircraft landings are softer then these things lol.
i think i got 17 inch alloys i not had the car long and to be fair its been a nightmare so far as the spec dont match up to anything iv seen online. and custom wiring and left cut wires i found under trims ect.
but i want to change the suspension to a bit softer landing and if i didnt find out that sri are so low i thought i had broken springs lol.
in short can anyone help with what options i got to get softer suspension and higher up ? 
thanks for listening to me waffle on lol 
i may ask in another question if i can find a post question tab again on the mismatch interior of my sri/eco no button/stop/start ? what when i turn the key lol wonderful invention lol. leather interior not on any spec options on vauxhall 
thanks