Some radical ideas that probably won’t be met with universal approval, but I do know the area quite well 
64
Extended from Thornton Heath Pond via Brigstock Road to the High Street. Withdrawn between Selsdon Park Road and New Addington and rerouted to Monks Hill. Reduced to every 15mins daytime and every 20mins evenings (see 353)
130
Retains original route through New Addington. Increased to every 20mins Sundays
194
Extended from West Croydon via London Road to Thornton Heath Pond
198
Withdrawn , replaced by changes to other routes
239
New double deck route. New Addington Homestead Way, Arnhem Drive and via the new 64 route to Addington Village, 466 route to East Croydon then via the 198 route to Thornton Heath High Street. Every 15mins, 20mins evenings
X239
As per the 239 from Homestead Way to Fieldway then non stop to East Croydon (can go direct via Coombe Road) then Wellesley Road terminating at West Croydon. Same frequency as 439.
353
Extended from Addington Village via current 64 route to West Croydon. Increased to every 20mins evenings and Sundays
359
Extended from Purley to Roundshaw via Foxley Lane, Plough Lane and Forresters Drive… Extended from Addington Village via old 64 route to New Addington Parkway. Monks Hill section withdrawn , replaced by 64. Increased to x15mins daytime.
433
Reduced to x15mins daytime
435
Half of the current 433 service West Croydon to Selsdon Vale then terminating at Courtwood Lane.
464
Retains original route in New Addington.
466
Withdrawn between Shirley Park and Addington Village and rerouted via 198 route to Shrublands.
361
New single deck route. West Wickham station (if suitable stand space can be found) Station Road, Wickham Ct Rd, Woodlands Ave, Oaklands Ave, The Grove, West Wickham High Street, Oak Avenue, Broom Road, Lime Tree Avenue, South Way, Shirley Church Road, Spout Hill (width restriction ammended) Addington Village then as erstwhile xxx route to New Addington Parkway. Every 15mins daytime, 20mins evening.
N264
Extended from Croydon via current 64 route to Addington Village (could included double run via Monks Hill?) then as per new 239 route to Homestead Way with short double run to serve Vulcan Way
Bullet points
*Monks Hill finally gets a direct link to Croydon
*130 keeps direct service via KHD from Goldcrest Way to Vulcan Way, there has been much dismay about its withdrawl
*194 retains the link from Shirley area to Mayday Hospital
*439/X439 provide a direct link from east of estate which is remote from Tramlink to Croydon, both routes providing local links within New Addington
*353 again provides a through service from Orpington to Croydon, now via Selsdon. Passengers still have the option of changing to Tramlink at AV for a quicker journey.