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I see you fly from time to time, imho it's easiest way.
Find some 2-4BR aircraft that can be used in attacking ground targets and do some Air RB. On majority of maps you will find a plenty of soft targets - focus on them. Best, if they are a little away from center of the map.
Check your inventory - if you have wager, use it. If you have order for most destroyed ground targets, use it during battle. Do not activate order from the start, be sure to be the winner. If you notice map with big number of soft targets, fly towards them. If you do not see anyone close to you, activate order and start destroying targets. In majority of battles all players will be focused on dogfights or chasing bombers - that's your chance for SL in big numbers.
When you search for proper aircraft, be sure to check SL gain % on stats card. If you have any low rank premium aircraft - most probably that will be your machine for SL.
If you do not want to use aircraft and want to do tank only, do not focus on killing. Just be active, try to cap and gain as many assists as you can. You will get many points and SL. Be sure to use nice lineup with at least 3 vehicles (but be sure to do not use the ones with big repair price
). IMHO most optimize line-up is 2-3 tanks + AAA + 1-2 CAS.
Start using them like this:
1- most expensive in spawn points tank
2- CAS or another tank (depends on situation on map)
3- another tank or AAA (if you lack spawn points after you failed with CAS)
4- tank and so on. Depends on your spawn points.
2nd CAS is there if you did good in 1st one and earn enough spawn points.
And use wagers. It's really hard to lose anything on them, and it's easy to get at least anything above what you bet.