Welcome along mate
Some decent brakes and pay for some instruction would be the best worthwhile things imo
Agreed - refreshing tired suspension can literally transform the car.If you must touch the suspension, simply refreshing OE parts (a set of cup dampers is something like £160 all in from Adam @ Renault Wolverhampton with CS.net club discount) with aftermarket springs (cooksports or eibach) is getting rated quite highly on here.