Young fast training players don't need to be training-for-high-q-rest-munching-whores. Using their high gains to achieve longevity is a decent strategy. But only if they perform.

I'd worry more about conserving Tokens than 'next season' MV drop. Particularly from around level 3 it will become more important to try to sign and sell FAs for cash so every 1 or 2T saved is cash.

Be disciplined in the TM, try to recognise which managers will go the distance, which times are quieter and set your limits.
(I buy tokens on my main but only once have I went beyond the 4th knockout round and until I'm much higher level I don't see me doing that again. I also play 35T teams (although not seriously last 3 seasons) and if I can't get a player for 2T (rare) or 3T I walk away.)