Build a lineup that survives the first loss
A lineup earns its place after the opening tank dies. If every remaining vehicle needs the same firing lane, or none can contest the objective, you brought several copies of one plan. Build around the situations you need to recover from.
Choose the ceiling before choosing the favorite
Select Ground RB and set a deliberate BR ceiling. Check every slot, including aircraft using their Ground Battles rating. One higher-rated addition can move all your tanks into a different bracket; a plane you rarely spawn can still make the ground lineup harder to use.
Ask what that addition solves. A better gun may justify moving up if the backups remain effective. A new vehicle that leaves you with one competitive spawn and several poor substitutes usually needs more supporting research before it becomes your default preset.
Build two dependable ground spawns first
Your first two fighting vehicles should both be able to contribute on the maps you actually see. They do not have to share a class. A mobile tank and a vehicle comfortable holding a lane can give you more recovery options than two slow tanks that require the same protected approach.
Dependable means more than matching the BR number. Check ammunition, reverse behavior, gun handling and the crew assigned to each vehicle. A fully upgraded backup with a familiar gun may be a better second spawn than a new tank whose useful ammunition is still locked.
Add a different answer to the map
Use a light vehicle or specialist to solve a specific problem: reach a covered flank, scout an approach, or cover a long crossing. A specialist earns a slot when it creates an option the main tanks lack. It does not earn one merely because the lineup has an empty space.
For example, your first tank dies while trying to cross into a town. Another slow frontal vehicle repeats the same problem. A mobile backup may reach a different block and cover the enemy's side, provided the route is still open. A turretless gun may instead work from a protected defensive lane if your team has already lost the crossing.
Give air defense a usable slot
Bring SPAA you can operate, with the ammunition and controls needed for its intended targets. Having an anti-air vehicle in the preset does little if you cannot acquire a target, judge an engagement or survive the drive out of spawn.
Keep a ground option available when air defense will not solve the immediate problem. If the team is losing the last capture point to tanks, another stationary gun watching empty sky may contribute less than a vehicle that can contest the approach. Choose the spawn for the situation rather than filling a fixed rotation.
Treat aircraft and backups as options, not a recovery plan
An aircraft must offer a useful task you can afford in spawn points and carry out with its available loadout. A revenge attack that removes one enemy while leaving your team without ground presence can still lose the match.
A vehicle backup gives another use of the same vehicle when eligible; it does not replace a different role or guarantee enough spawn points. It also does not fix an exposed route. Before respawning, choose the position and job first, then select the vehicle that can perform them.
Advance when the next preset can fight twice
Research toward a small working lineup rather than chasing the next headline tank in isolation. Fund training and useful modifications for the backups as well as the first spawn. You should be able to name an opening for an open map, an opening for a city map, and a useful response after either one fails.