Translation of "Regain" in Spanish

I need to regain my strength.

Tengo que recuperar fuerzas.

Razvan fought to regain the throne, but was defeated.

Razvan luchó para recobrar el trono, pero fue derrotado.

Tom never did regain his memory after the accident.

Tom nunca recuperó su memoria después del accidente.

I hope your mother will regain her health soon.

Espero que tu madre recupere su salud pronto.

This would enable Carthage to regain its' dominance on the sea.

Esto le permitiría a Cartago el retomar dominio marítimo.